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Archduke Franz Ferdinand

Tensions had been brewing throughout Europe-especially in the troubled Balkan region of southeast Europe-for years before World War I actually broke out.

A number of alliances involving European powers, the Ottoman Empire, Russia and other parties had existed for years, but political instability in the Balkans (particularly Bosnia, Serbia and Herzegovina) threatened to destroy these agreements.

The spark that ignited World War I was struck in Sarajevo, Bosnia, where Archduke Franz Ferdinand -heir to the Austro-Hungarian Empire-was shot to death along with his wife, Sophie, by the Serbian nationalist Gavrilo Princip on June 28, 1914. Princip and other nationalists were struggling to end Austro-Hungarian rule over Bosnia and Herzegovina.

The assassination of Franz Ferdinand set off a rapidly escalating chain of events: Austria-Hungary, like many countries around the world, blamed the Serbian government for the attack and hoped to use the incident as justification for settling the question of Serbian nationalism once and for all.

Kaiser Wilhelm II

Because mighty Russia supported Serbia, Austria-Hungary waited to declare war until its leaders received assurance from German leader Kaiser Wilhelm II that Germany would support their cause. Austro-Hungarian leaders feared that a Russian intervention would involve Russia's ally, France, and possibly Great Britain as well.

On July 5, Kaiser Wilhelm secretly pledged his support, giving Austria-Hungary a so-called carte blanche, or "blank check" assurance of Germany's backing in the case of war. The Dual Monarchy of Austria-Hungary then sent an ultimatum to Serbia, with such harsh terms as to make it almost impossible to accept.

World War I Begins

Convinced that Austria-Hungary was readying for war, the Serbian government ordered the Serbian army to mobilize and appealed to Russia for assistance. On July 28, Austria-Hungary declared war on Serbia, and the tenuous peace between Europe's great powers quickly collapsed.

Within a week, Russia, Belgium, France, Great Britain and Serbia had lined up against Austria-Hungary and Germany, and World War I had begun.

The Western Front

According to an aggressive military strategy known as the Schlieffen Plan (named for its mastermind, German Field Marshal Alfred von Schlieffen), Germany began fighting World War I on two fronts, invading France through neutral Belgium in the west and confronting Russia in the east.

On August 4, 1914, German troops crossed the border into Belgium. In the first battle of World War I, the Germans assaulted the heavily fortified city of Liege, using the most powerful weapons in their arsenal-enormous siege cannons-to capture the city by August 15. The Germans left death and destruction in their wake as they advanced through Belgium toward France, shooting civilians and executing a Belgian priest they had accused of inciting civilian resistance.

First Battle of the Marne

In the First Battle of the Marne, fought from September 6-9, 1914, French and British forces confronted the invading German army, which had by then penetrated deep into northeastern France, within 30 miles of Paris. The Allied troops checked the German advance and mounted a successful counterattack, driving the Germans back to the north of the Aisne River.

The defeat meant the end of German plans for a quick victory in France. Both sides dug into trenches, and the Western Front was the setting for a hellish war of attrition that would last more than three years.

Particularly long and costly battles in this campaign were fought at Verdun (February-December 1916) and the Battle of the Somme (July-November 1916). German and French troops suffered close to a million casualties in the Battle of Verdun alone.

World War I Books and Art

The bloodshed on the battlefields of the Western Front, and the difficulties its soldiers had for years after the fighting had ended, inspired such works of art as " All Quiet on the Western Front" by Erich Maria Remarque and " In Flanders Fields"by Canadian doctor Lieutenant-Colonel John McCrae. In the latter poem, McCrae writes from the perspective of the fallen soldiers:

Published in 1915, the poem inspired the use of the poppy as a symbol of remembrance.

Visual artists like Otto Dix of Germany and British painters Wyndham Lewis, Paul Nash and David Bomberg used their firsthand experience as soldiers in World War I to create their art, capturing the anguish of trench warfare and exploring the themes of technology, violence and landscapes decimated by war.

The Eastern Front

On the Eastern Front of World War I, Russian forces invaded the German-held regions of East Prussia and Poland but were stopped short by German and Austrian forces at the Battle of Tannenberg in late August 1914.

Despite that victory, Russia's assault forced Germany to move two corps from the Western Front to the Eastern, contributing to the German loss in the Battle of the Marne.

Combined with the fierce Allied resistance in France, the ability of Russia's huge war machine to mobilize relatively quickly in the east ensured a longer, more grueling conflict instead of the quick victory Germany had hoped to win under the Schlieffen Plan.

Russian Revolution

From 1914 to 1916, Russia's army mounted several offensives on World War I's Eastern Front but was unable to break through German lines.

Defeat on the battlefield, combined with economic instability and the scarcity of food and other essentials, led to mounting discontent among the bulk of Russia's population, especially the poverty-stricken workers and peasants. This increased hostility was directed toward the imperial regime of Czar Nicholas II and his unpopular German-born wife, Alexandra.

Russia's simmering instability exploded in the Russian Revolution of 1917, spearheaded by Vladimir Lenin and the Bolsheviks, which ended czarist rule and brought a halt to Russian participation in World War I.

Russia reached an armistice with the Central Powers in early December 1917, freeing German troops to face the remaining Allies on the Western Front.

America Enters World War I

At the outbreak of fighting in 1914, the United States remained on the sidelines of World War I, adopting the policy of neutrality favored by President Woodrow Wilson while continuing to engage in commerce and shipping with European countries on both sides of the conflict.

Neutrality, however, it was increasingly difficult to maintain in the face of Germany's unchecked submarine aggression against neutral ships, including those carrying passengers. In 1915, Germany declared the waters surrounding the British Isles to be a war zone, and German U-boats sunk several commercial and passenger vessels, including some U.S. ships.

Widespread protest over the sinking by U-boat of the British ocean liner Lusitania-traveling from New York to Liverpool, England with hundreds of American passengers onboard-in May 1915 helped turn the tide of American public opinion against Germany. In February 1917, Congress passed a $250 million arms appropriations bill intended to make the United States ready for war.

Germany sunk four more U.S. merchant ships the following month, and on April 2 Woodrow Wilson appeared before Congress and called for a declaration of war against Germany.

Gallipoli Campaign

With World War I having effectively settled into a stalemate in Europe, the Allies attempted to score a victory against the Ottoman Empire, which entered the conflict on the side of the Central Powers in late 1914.

After a failed attack on the Dardanelles (the strait linking the Sea of Marmara with the Aegean Sea), Allied forces led by Britain launched a large-scale land invasion of the Gallipoli Peninsula in April 1915. The invasion also proved a dismal failure, and in January 1916 Allied forces staged a full retreat from the shores of the peninsula after suffering 250,000 casualties.

Did you know? The young Winston Churchill, then first lord of the British Admiralty, resigned his command after the failed Gallipoli campaign in 1916, accepting a commission with an infantry battalion in France.

British-led forces also combated the Ottoman Turks in Egypt and Mesopotamia, while in northern Italy, Austrian and Italian troops faced off in a series of 12 battles along the Isonzo River, located at the border between the two nations.

Battle of the Isonzo

The First Battle of the Isonzo took place in the late spring of 1915, soon after Italy's entrance into the war on the Allied side. In the Twelfth Battle of the Isonzo, also known as the Battle of Caporetto (October 1917), German reinforcements helped Austria-Hungary win a decisive victory.

After Caporetto, Italy's allies jumped in to offer increased assistance. British and French-and later, American-troops arrived in the region, and the Allies began to take back the Italian Front.

World War I at Sea

In the years before World War I, the superiority of Britain's Royal Navy was unchallenged by any other nation's fleet, but the Imperial German Navy had made substantial strides in closing the gap between the two naval powers. Germany's strength on the high seas was also aided by its lethal fleet of U-boat submarines.

After the Battle of Dogger Bank in January 1915, in which the British mounted a surprise attack on German ships in the North Sea, the German navy chose not to confront Britain's mighty Royal Navy in a major battle for more than a year, preferring to rest the bulk of its naval strategy on its U-boats.

The biggest naval engagement of World War I, the Battle of Jutland (May 1916) left British naval superiority on the North Sea intact, and Germany would make no further attempts to break an Allied naval blockade for the remainder of the war.

World War I Planes

World War I was the first major conflict to harness the power of planes. Though not as impactful as the British Royal Navy or Germany's U-boats, the use of planes in World War I presaged their later, pivotal role in military conflicts around the globe.

At the dawn of World War I, aviation was a relatively new field; the Wright brothers took their first sustained flight just eleven years before, in 1903. Aircraft were initially used primarily for reconnaissance missions. During the First Battle of the Marne, information passed from pilots allowed the allies to exploit weak spots in the German lines, helping the Allies to push Germany out of France.

The first machine guns were successfully mounted on planes in June of 1912 in the United States, but were imperfect; if timed incorrectly, a bullet could easily destroy the propeller of the plane it came from. The Morane-Saulnier L, a French plane, provided a solution: The propeller was armored with deflector wedges that prevented bullets from hitting it. The Morane-Saulnier Type L was used by the French, the British Royal Flying Corps (part of the Army), the British Royal Navy Air Service and the Imperial Russian Air Service. The British Bristol Type 22 was another popular model used for both reconnaissance work and as a fighter plane.

Dutch inventor Anthony Fokker improved upon the French deflector system in 1915. His "interrupter" synchronized the firing of the guns with the plane's propeller to avoid collisions. Though his most popular plane during WWI was the single-seat Fokker Eindecker, Fokker created over 40 kinds of airplanes for the Germans.

The Allies debuted the Handley-Page HP O/400, the first two-engine bomber, in 1915. As aerial technology progressed, long-range heavy bombers like Germany's Gotha G.V. (first introduced in 1917) were used to strike cities like London. Their speed and maneuverability proved to be far deadlier than Germany's earlier Zeppelin raids.

By the war's end, the Allies were producing five times more aircraft than the Germans. On April 1, 1918, the British created the Royal Air Force, or RAF, the first air force to be a separate military branch independent from the navy or army.

Second Battle of the Marne

With Germany able to build up its strength on the Western Front after the armistice with Russia, Allied troops struggled to hold off another German offensive until promised reinforcements from the United States were able to arrive.

On July 15, 1918, German troops launched what would become the last German offensive of the war, attacking French forces (joined by 85,000 American troops as well as some of the British Expeditionary Force) in the Second Battle of the Marne. The Allies successfully pushed back the German offensive and launched their own counteroffensive just three days later.

After suffering massive casualties, Germany was forced to call off a planned offensive further north, in the Flanders region stretching between France and Belgium, which was envisioned as Germany's best hope of victory.

The Second Battle of the Marne turned the tide of war decisively towards the Allies, who were able to regain much of France and Belgium in the months that followed.

The Harlem Hellfighters and Other All-Black Regiments

By the time World War I began, there were four all-Black regiments in the U.S. military: the 24th and 25th Infantry and the 9th and 10th Cavalry. All four regiments comprised of celebrated soldiers who fought in the Spanish-American War and American-Indian Wars, and served in the American territories. But they were not deployed for overseas combat in World War I.

Blacks serving alongside white soldiers on the front lines in Europe was inconceivable to the U.S. military. Instead, the first African American troops sent overseas served in segregated labor battalions, restricted to menial roles in the Army and Navy, and shutout of the Marines, entirely. Their duties mostly included unloading ships, transporting materials from train depots, bases and ports, digging trenches, cooking and maintenance, removing barbed wire and inoperable equipment, and burying soldiers.

Facing criticism from the Black community and civil rights organizations for its quotas and treatment of African American soldiers in the war effort, the military formed two Black combat units in 1917, the 92nd and 93rd Divisions. Trained separately and inadequately in the United States, the divisions fared differently in the war. The 92nd faced criticism for their performance in the Meuse-Argonne campaign in September 1918. The 93rd Division, however, had more success.

With dwindling armies, France asked America for reinforcements, and General John Pershing, commander of the American Expeditionary Forces, sent regiments in the 93 Division to over, since France had experience fighting alongside Black soldiers from their Senegalese French Colonial army. The 93 Division's 369 regiment, nicknamed the Harlem Hellfighters, fought so gallantly, with a total of 191 days on the front lines, longer than any AEF regiment, that France awarded them the Croix de Guerre for their heroism. More than 350,000 African American soldiers would serve in World War I in various capacities.

Toward Armistice

By the fall of 1918, the Central Powers were unraveling on all fronts.

Despite the Turkish victory at Gallipoli, later defeats by invading forces and an Arab revolt that destroyed the Ottoman economy and devastated its land, and the Turks signed a treaty with the Allies in late October 1918.

Austria-Hungary, dissolving from within due to growing nationalist movements among its diverse population, reached an armistice on November 4. Facing dwindling resources on the battlefield, discontent on the homefront and the surrender of its allies, Germany was finally forced to seek an armistice on November 11, 1918, ending World War I.

Treaty of Versailles

At the Paris Peace Conference in 1919, Allied leaders stated their desire to build a post-war world that would safeguard itself against future conflicts of such a devastating scale.

Some hopeful participants had even begun calling World War I "the War to End All Wars." But the Treaty of Versailles, signed on June 28, 1919, would not achieve that lofty goal.

Saddled with war guilt, heavy reparations and denied entrance into the League of Nations, Germany felt tricked into signing the treaty, having believed any peace would be a "peace without victory," as put forward by President Wilson in his famous Fourteen Points speech of January 1918.

As the years passed, hatred of the Versailles treaty and its authors settled into a smoldering resentment in Germany that would, two decades later, be counted among the causes of World War II.

World War I Casualties

World War I took the lives of more than 9 million soldiers; 21 million more were wounded. Civilian casualties numbered close to 10 million. The two nations most affected were Germany and France, each of which sent some 80 percent of their male populations between the ages of 15 and 49 into battle.

The political disruption surrounding World War I also contributed to the fall of four venerable imperial dynasties: Germany, Austria-Hungary, Russia and Turkey.

Legacy of World War I

World War I brought about massive social upheaval, as millions of women entered the workforce to replace men who went to war and those who never came back. The first global war also helped to spread one of the world's deadliest global pandemics, the Spanish flu epidemic of 1918, which killed an estimated 20 to 50 million people.

World War I has also been referred to as "the first modern war." Many of the technologies now associated with military conflict-machine guns, tanks, aerial combat and radio communications-were introduced on a massive scale during World War I.

The severe effects that chemical weapons such as mustard gas and phosgene had on soldiers and civilians during World War I galvanized public and military attitudes against their continued use. The Geneva Convention agreements, signed in 1925, restricted the use of chemical and biological agents in warfare and remain in effect today.

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World War I: Summary, Causes & Facts | HISTORY

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World War I began in 1914, after the assassination of Archduke Franz Ferdinand, and lasted until 1918. During the conflict, Germany, Austria‑Hungary, Bulgaria and the Ottoman Empire (the Central Powers) fought against Great Britain, France, Russia, Italy, Romania, Japan and the United States (the Allied Powers).

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Contents

1. Leading up to World War II

2. Outbreak of World War II (1939)

3. World War II in the West (1940-41)

4. Hitler vs. Stalin: Operation Barbarossa (1941-42)

5. World War II in the Pacific (1941-43)

6. Toward Allied Victory in World War II (1943-45)

7. World War II Ends (1945)

8. African American Servicemen Fight Two Wars

9. World War II Casualties and Legacy

10. Photo Galleries

The instability created in Europe by the First World War (1914-18) set the stage for another international conflict-World War II-which broke out two decades later and would prove even more devastating. Rising to power in an economically and politically unstable Germany, Adolf Hitler Adolf Hitler, leader of the Nazi Party, rearmed the nation and signed strategic treaties with Italy and Japan to further his ambitions of world domination. Hitler's invasion of Poland in September 1939 drove Great Britain and France to declare war on Germany, marking the beginning of World War II. Over the next six years, the conflict would take more lives and destroy more land and property around the globe than any previous war. Among the estimated 45-60 million people killed were 6 million Jews murdered in Nazi concentration camps as part of Hitler's diabolical "Final Solution," now known as the Holocaust.

Leading up to World War II

The devastation of the Great War (as World War I was known at the time) had greatly destabilized Europe, and in many respects World War II grew out of issues left unresolved by that earlier conflict. In particular, political and economic instability in Germany, and lingering resentment over the harsh terms imposed by the Versailles Treaty, fueled the rise to power of Adolf Hitler and National Socialist German Workers' Party, abbreviated as NSDAP in German and the Nazi Party in English..

Did you know? As early as 1923, in his memoir and propaganda tract "Mein Kampf" (My Struggle), Adolf Hitler had predicted a general European war that would result in "the extermination of the Jewish race in Germany."

After becoming Chancellor of Germany in 1933, Hitler swiftly consolidated power, anointing himself Führer (supreme leader) in 1934. Obsessed with the idea of the superiority of the "pure" German race, which he called "Aryan," Hitler believed that war was the only way to gain the necessary "Lebensraum," or living space, for the German race to expand. In the mid-1930s, he secretly began the rearmament of Germany, a violation of the Versailles Treaty. After signing alliances with Italy and Japan against the Soviet Union, Hitler sent troops to occupy Austria in 1938 and the following year annexed Czechoslovakia. Hitler's open aggression went unchecked, as the United States and Soviet Union were concentrated on internal politics at the time, and neither France nor Britain (the two other nations most devastated by the Great War) were eager for confrontation.

Outbreak of World War II (1939)

In late August 1939, Hitler and Soviet leader Joseph Stalin signed the German-Soviet Nonaggression Pact, which incited a frenzy of worry in London and Paris. Hitler had long planned an invasion of Poland, a nation to which Great Britain and France had guaranteed military support if it were attacked by Germany. The pact with Stalin meant that Hitler would not face a war on two fronts once he invaded Poland, and would have Soviet assistance in conquering and dividing the nation itself. On September 1, 1939, Hitler invaded Poland from the west; two days later, France and Britain declared war on Germany, beginning World War II.

On September 17, Soviet troops invaded Poland from the east. Under attack from both sides, Poland fell quickly, and by early 1940 Germany and the Soviet Union had divided control over the nation, according to a secret protocol appended to the Nonaggression Pact. Stalin's forces then moved to occupy the Baltic States (Estonia, Latvia and Lithuania) and defeated a resistant Finland in the Russo-Finish War. During the six months following the invasion of Poland, the lack of action on the part of Germany and the Allies in the west led to talk in the news media of a "phony war." At sea, however, the British and German navies faced off in heated battle, and lethal German U-boat submarines struck at merchant shipping bound for Britain, sinking more than 100 vessels in the first four months of World War II.

World War II in the West (1940-41)

On April 9, 1940, Germany simultaneously invaded Norway and occupied Denmark, and the war began in earnest. On May 10, German forces swept through Belgium and the Netherlands in what became known as "blitzkrieg," or lightning war. Three days later, Hitler's troops crossed the Meuse River and struck French forces at Sedan, located at the northern end of the Maginot Line, an elaborate chain of fortifications constructed after World War I and considered an impenetrable defensive barrier. In fact, the Germans broke through the line with their tanks and planes and continued to the rear, rendering it useless. The British Expeditionary Force (BEF) was evacuated by sea from Dunkirk in late May, while in the south French forces mounted a doomed resistance. With France on the verge of collapse, Italy's fascist dictator Benito Mussolini formed an alliance with Hitler, the Pact of Steel, and Italy declared war against France and Britain on June 10.

On June 14, German forces entered Paris; a new government formed by Marshal Philippe Petain (France's hero of World War I) requested an armistice two nights later. France was subsequently divided into two zones, one under German military occupation and the other under Petain's government, installed at Vichy France. Hitler now turned his attention to Britain, which had the defensive advantage of being separated from the Continent by the English Channel.

To pave the way for an amphibious invasion (dubbed Operation Sea Lion), German planes bombed Britain extensively beginning in September 1940 until May 1941, known as the Blitz, including night raids on London and other industrial centers that caused heavy civilian casualties and damage. The Royal Air Force (RAF) eventually defeated the Luftwaffe (German Air Force) in the Battle of Britain, and Hitler postponed his plans to invade. With Britain's defensive resources pushed to the limit, Prime Minister Winston Churchill began receiving crucial aid from the U.S. under the Lend-Lease Act, passed by Congress in early 1941.

Hitler vs. Stalin: Operation Barbarossa (1941-42)

By early 1941, Hungary, Romania and Bulgaria had joined the Axis, and German troops overran Yugoslavia and Greece that April. Hitler's conquest of the Balkans was a precursor for his real objective: an invasion of the Soviet Union, whose vast territory would give the German master race the "Lebensraum" it needed. The other half of Hitler's strategy was the extermination of the Jews from throughout German-occupied Europe. Plans for the "Final Solution" were introduced around the time of the Soviet offensive, and over the next three years more than 4 million Jews would perish in the death camps established in occupied Poland.

On June 22, 1941, Hitler ordered the invasion of the Soviet Union, codenamed Operation Barbarossa. Though Soviet tanks and aircraft greatly outnumbered the Germans', Russian aviation technology was largely obsolete, and the impact of the surprise invasion helped Germans get within 200 miles of Moscow by mid-July. Arguments between Hitler and his commanders delayed the next German advance until October, when it was stalled by a Soviet counteroffensive and the onset of harsh winter weather.

World War II in the Pacific (1941-43)

With Britain facing Germany in Europe, the United States was the only nation capable of combating Japanese aggression, which by late 1941 included an expansion of its ongoing war with China and the seizure of European colonial holdings in the Far East. On December 7, 1941, 360 Japanese aircraft attacked the major U.S. naval base at Pearl Harbor in Hawaii, taking the Americans completely by surprise and claiming the lives of more than 2,300 troops. The attack on Pearl Harbor served to unify American public opinion in favor of entering World War II, and on December 8 Congress declared war on Japan with only one dissenting vote. Germany and the other Axis Powers promptly declared war on the United States.

After a long string of Japanese victories, the U.S. Pacific Fleet won the Battle of Midway in June 1942, which proved to be a turning point in the war. On Guadalcanal, one of the southern Solomon Islands, the Allies also had success against Japanese forces in a series of battles from August 1942 to February 1943, helping turn the tide further in the Pacific. In mid-1943, Allied naval forces began an aggressive counterattack against Japan, involving a series of amphibious assaults on key Japanese-held islands in the Pacific. This "island-hopping" strategy proved successful, and Allied forces moved closer to their ultimate goal of invading the mainland Japan.

Toward Allied Victory in World War II (1943-45)

In North Africa, British and American forces had defeated the Italians and Germans by 1943. An Allied invasion of Sicily and Italy followed, and Mussolini's government fell in July 1943, though Allied fighting against the Germans in Italy would continue until 1945.

On the Eastern Front, a Soviet counteroffensive launched in November 1942 ended the bloody Battle of Stalingrad, which had seen some of the fiercest combat of World War II. The approach of winter, along with dwindling food and medical supplies, spelled the end for German troops there, and the last of them surrendered on January 31, 1943.

On June 6, 1944-celebrated as "D-Day"-the Allies began a massive invasion of Europe, landing 156,000 British, Canadian and American soldiers on the beaches of Normandy, France. In response, Hitler poured all the remaining strength of his army into Western Europe, ensuring Germany's defeat in the east. Soviet troops soon advanced into Poland, Czechoslovakia, Hungary and Romania, while Hitler gathered his forces to drive the Americans and British back from Germany in the Battle of the Bulge (December 1944-January 1945), the last major German offensive of the war.

An intensive aerial bombardment in February 1945 preceded the Allied land invasion of Germany, and by the time Germany formally surrendered on May 8, Soviet forces had occupied much of the country. Hitler was already dead, having died by suicide on April 30 in his Berlin bunker.

World War II Ends (1945)

At the Potsdam Conference of July-August 1945, U.S. President Harry S. Truman (who had taken office after Roosevelt's death in April), Churchill and Stalin discussed the ongoing war with Japan as well as the peace settlement with Germany. Post-war Germany would be divided into four occupation zones, to be controlled by the Soviet Union, Britain, the United States and France. On the divisive matter of Eastern Europe's future, Churchill and Truman acquiesced to Stalin, as they needed Soviet cooperation in the war against Japan.

Heavy casualties sustained in the campaigns at Iwo Jima (February 1945) and Okinawa (April-June 1945), and fears of the even costlier land invasion of Japan led Truman to authorize the use of a new and devastating weapon. Developed during a top secret operation code-named The Manhattan Project, the atomic bomb was unleashed on the Japanese cities of Hiroshima and Nagasaki in early August. On August 15, the Japanese government issued a statement declaring they would accept the terms of the Potsdam Declaration, and on September 2, U.S. General Douglas MacArthur accepted Japan's formal surrender aboard the USS Missouri in Tokyo Bay.

African American Servicemen Fight Two Wars

The National Archives

World War II exposed a glaring paradox within the United States Armed Forces. Although more than 1 million African Americans served in the war to defeat Nazism and fascism, they did so in segregated units. The same discriminatory Jim Crow policies that were rampant in American society were reinforced by the U.S. military. Black servicemen rarely saw combat and were largely relegated to labor and supply units that were commanded by white officers.

There were several African American units that proved essential in helping to win World War II, with the Tuskegee Airmen being among the most celebrated. But the Red Ball Express, the truck convoy of mostly Black drivers were responsible for delivering essential goods to General George S. Patton's troops on the front lines in France. The all-Black 761st Tank Battalion fought in the Battle of the Bulge, and the 92 Infantry Division, fought in fierce ground battles in Italy. Yet, despite their role in defeating fascism, the fight for equality continued for African American soldiers after the World War II ended. They remained in segregated units and lower-ranking positions, well into the Korean War, a few years after President Truman signed an executive order to desegregate the U.S. military in 1948.
READ MORE: Black Americans Who Served in WWII Faced Discrimination Abroad and at Home
World War II Casualties and Legacy

World War II proved to be the deadliest international conflict in history, taking the lives of 60 to 80 million people, including 6 million Jews who died at the hands of the Nazis during the Holocaust. Civilians made up an estimated 50-55 million deaths from the war, while military comprised 21 to 25 million of those lost during the war. Millions more were injured, and still more lost their homes and property.

The legacy of the war would include the spread of communism from the Soviet Union into eastern Europe as well as its eventual triumph in China, and the global shift in power from Europe to two rival superpowers-the United States and the Soviet Union-that would soon face off against each other in the Cold War.

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World War II was a global war that lasted from 1939 to 1945. Rising to power in an unstable Germany, Adolf Hitler and his National Socialist (Nazi Party) rearmed the nation and signed treaties with Italy and Japan to further his ambitions of world domination.

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World War II ended six years and one day after Germany's invasion of Poland on September 1, 1939, sparked the 20th century's second global conflict. By the time it concluded on the deck of an American warship on September 2, 1945, World War II had claimed the lives of an estimated 60-80 million people, approximately 3 percent of the world's population. The vast majority of those who died in history's deadliest war were civilians, including 6 million Jews killed in Nazi concentration camps during the Holocaust.

Germany employed its "blitzkrieg" ("lightning war") strategy to sweep across the Netherlands, Belgium and France in the war's opening months and force more than 300,000 British and other Allied troops to evacuate continental Europe from Dunkirk. In June 1941, German dictator Adolf Hitler broke his nonaggression pact with the Soviet Union and launched Operation Barbarossa, which brought Nazi troops to the gates of Moscow.

By the time the United States entered World War II following the Japanese bombing of Pearl Harbor, German forces occupied much of Europe from the Black Sea to the English Channel. The Allies, however, turned the tide of the conflict, and the following major events brought World War II to an end.
WATCH: 'Hiroshima: 75 Years Later' on HISTORY Vault
1. Germany Repelled on Two Fronts
WATCH: The Lasting Impact of War
After storming across Europe in the first three years of the war, overextended Axis forces were put on the defensive after the Soviet Red Army rebuffed them in the brutal Battle of Stalingrad, which lasted from August 1942 to February 1943. The fierce battle for the city named after Soviet dictator Joseph Stalin resulted in nearly two million casualties, including the deaths of tens of thousands of Stalingrad residents.

As Soviet troops began to advance on the Eastern Front, the Western Allies invaded Sicily and southern Italy, causing the fall of Italian dictator Benito Mussolini's government in July 1943. The Allies then opened a Western Front with the amphibious D-Day invasion of Normandy on June 6, 1944. After gaining a foothold in northern France, Allied troops liberated Paris on August 25 followed by Brussels less than two weeks later.
READ MORE: 8 Things You Should Know About WWII's Eastern Front
2. Battle of the Bulge

Germany found itself squeezed on both sides as Soviet troops advanced into Poland, Czechoslovakia, Hungary and Romania while the Western Allies continued to push eastward. Forced to fight a two-front war with dwindling resources, an increasingly desperate Hitler authorized a last-ditch offensive on the Western Front in hopes of splitting the Allied lines. The Nazis launched a surprise attack along an 80-mile, densely wooded stretch of the Ardennes Forest in Belgium and Luxembourg on December 16, 1944.

The German onslaught caused the Allied line to bulge, but it would not break during six weeks of fighting in subzero conditions that left soldiers suffering from hypothermia, frostbite and trench foot. American forces withstood the full might of what was left of Germany's power but lost approximately 20,000 men in what was their deadliest single battle in World War II. What became known as the Battle of the Bulge would turn out to be Germany's last gasp as the Soviet Red Army launched a winter offensive on the Eastern Front that would have them at the Oder River, less than 50 miles from the German capital of Berlin, by the spring.
READ MORE: How American Grit Defeated Hitler's Last-Ditch Strike
3. Germany Surrenders

After the firebombing of Dresden and other German cities that killed tens of thousands of civilians, the Western Allies crossed the Rhine River and moved eastward toward Berlin. As they closed in on the capital, Allied troops discovered the horror of the Holocaust as they liberated concentration camps such as Bergen-Belsen and Dachau. With both fronts collapsing and defeat inevitable, Hitler committed suicide in his bunker deep below the Reich Chancellery on April 30, 1945.

Hitler's successor, Grand Admiral Karl Dönitz, started peace negotiations and on May 7 authorized General Alfred Jodl to sign an unconditional surrender of all German forces to take effect the following day. Stalin, however, refused to accept the surrender agreement inked at the headquarters of U.S. General Dwight D. Eisenhower in Reims, France, and forced the Germans to sign another one the following day in Soviet-occupied Berlin.
READ MORE: The Shocking Liberation of Auschwitz: Soviets 'Knew Nothing' as They Approached
4. Atomic Bombing of Hiroshima and Nagasaki

Even after the Allied victory in Europe, World War II continued to rage in the Pacific Theater. American forces had made a slow, but steady push toward Japan after turning the course of the war with victory at the June 1942 Battle of the Midway. The Battles of Iwo Jima and Okinawa in the winter and spring of 1945 were among the bloodiest of the war, and the American military projected that as many as 1 million casualties would accompany any invasion of the Japanese mainland.

Weeks after the first successful test of the atomic bomb occurred in Alamogordo, New Mexico, on July 16, 1945, President Harry Truman, who had ascended to the presidency less than four months earlier after the death of Franklin D. Roosevelt, authorized its use against Japan in the hopes of bringing a swift end to the war. On August 6, 1945, the American B-29 bomber Enola Gay dropped an atomic bomb on the manufacturing city of Hiroshima, immediately killing an estimated 80,000 people. Tens of thousands later died of radiation exposure. When Japan failed to immediately surrender after the bombing of Hiroshima, the United States detonated an even more powerful atomic bomb on Nagasaki three days later that killed 35,000 instantly and another 50,000 in its aftermath.
PHOTOS: Hiroshima and Nagasaki Before and After
5. Soviets Declare War, Japan Surrenders

In addition to the bombings of Hiroshima and Nagasaki, Japan came under increasing pressure when the Soviet Union formally declared war on August 8 and invaded Japanese-occupied Manchuria in northeastern China. With his Imperial Council deadlocked, Japan's Emperor Hirohito broke the tie and decided that his country must surrender. At noon on August 15 (Japanese time), the emperor announced Japan's surrender in his first-ever radio broadcast.

On September 2, World War II ended when U.S. General Douglas MacArthur accepted Japan's formal surrender aboard the U.S. battleship Missouri, anchored in Tokyo Bay along with a flotilla of more than 250 Allied warships.

At the signing of the agreement that brought an end to 2,194 days of global war, MacArthur told the world in a radio broadcast, "Today the guns are silent. A great tragedy has ended. A great victory has been won."
SEE MORE: World War II Ends: 22 Photos of Giddy Celebration After Allied Victory

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World War II ended six years and one day after Germany's invasion of Poland on September 1, 1939, sparked the 20th century's second global conflict. By the time it concluded on the deck of an American warship on September 2, 1945, World War II had claimed the lives of an estimated 60-80 million people, approximately 3 percent of the world's population.

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World Trade Center

On September 11, 2001, at 8:45 a.m. on a clear Tuesday morning, an American Airlines Boeing 767 loaded with 20,000 gallons of jet fuel crashed into the north tower of the World Trade Center in New York City.

The impact left a gaping, burning hole near the 80th floor of the 110-story skyscraper, instantly killing hundreds of people and trapping hundreds more in higher floors.

As the evacuation of the tower and its twin got underway, television cameras broadcasted live images of what initially appeared to be a freak accident. Then, 18 minutes after the first plane hit, a second Boeing 767-United Airlines Flight 175-appeared out of the sky, turned sharply toward the World Trade Center and sliced into the south tower near the 60th floor.

The collision caused a massive explosion that showered burning debris over surrounding buildings and onto the streets below. It immediately became clear that America was under attack.

Osama bin Laden

The hijackers were Islamic terrorists from Saudi Arabia and several other Arab nations. Reportedly financed by the al Qaeda terrorist organization of Saudi fugitive Osama bin Laden, they were allegedly acting in retaliation for America's support of Israel, its involvement in the Persian Gulf War and its continued military presence in the Middle East.

Some of the terrorists had lived in the United States for more than a year and had taken flying lessons at American commercial flight schools. Others had slipped into the country in the months before September 11 and acted as the "muscle" in the operation.

Where Did the 9/11 Planes Take Off From?

The 19 terrorists smuggled box-cutters and knives through security at three East Coast airports-Logan International Airport in Boston, Dulles International Airport in Washington, D.C. and Newark International Airport in New Jersey-and boarded four early-morning flights bound for California, chosen because the planes were loaded with fuel for the long transcontinental journey. Soon after takeoff, the terrorists commandeered the four planes and took the controls, transforming ordinary passenger jets into guided missiles.

Pentagon Attack

As millions watched the events unfolding in New York, American Airlines Flight 77 circled over downtown Washington, D.C., before crashing into the west side of the Pentagon military headquarters at 9:45 a.m.

Jet fuel from the Boeing 757 caused a devastating inferno that led to the structural collapse of a portion of the giant concrete building, which is the headquarters of the U.S. Department of Defense.

All told, 125 military personnel and civilians were killed in the Pentagon, along with all 64 people aboard the airliner.

Twin Towers Collapse

Less than 15 minutes after the terrorists struck the nerve center of the U.S. military, the horror in New York took a catastrophic turn when the south tower of the World Trade Center collapsed in a massive cloud of dust and smoke.

The structural steel of the skyscraper, built to withstand winds in excess of 200 miles per hour and a large conventional fire, could not withstand the tremendous heat generated by the burning jet fuel.

At 10:30 a.m., the north building of the twin towers collapsed. Only 18 people in the World Trade Center towers at the time of the collapse survived. Most were with a group of FDNY firefighters in the North Tower's Stairwell B, which remained intact. One woman survived after the stairs she was rushing down disintegrated around her. Almost 10,000 others were treated for injuries, many severe.

Flight 93

Meanwhile, a fourth California-bound plane- United Flight 93-was hijacked about 40 minutes after leaving Newark Liberty International Airport in New Jersey. Because the plane had been delayed in taking off, passengers on board learned of events in New York and Washington via cell phone and Airfone calls to the ground.

Knowing that the aircraft was not returning to an airport as the hijackers claimed, a group of passengers and flight attendants planned an insurrection.

One of the passengers, Thomas Burnett, Jr., told his wife over the phone that "I know we're all going to die. There's three of us who are going to do something about it. I love you, honey." Another passenger-Todd Beamer-was heard saying "Are you guys ready? Let's roll" over an open line.

Sandy Bradshaw, a flight attendant, called her husband and explained that she had slipped into a galley and was filling pitchers with boiling water. Her last words to him were "Everyone's running to first class. I've got to go. Bye."

The passengers fought the four hijackers and are suspected to have attacked the cockpit with a fire extinguisher. The plane then flipped over and sped toward the ground at upwards of 500 miles per hour, crashing in a rural field near Shanksville in western Pennsylvania at 10:10 a.m.

All 44 people aboard were killed. Its intended target is not known, but theories include the White House, the U.S. Capitol, the Camp David presidential retreat in Maryland or one of several nuclear power plants along the eastern seaboard.

How Many People Died in the 9/11 Attacks?

A total of 2,996 people were killed in the 9/11 attacks, including the 19 terrorist hijackers aboard the four airplanes. Citizens of 78 countries died in New York, Washington, D.C., and Pennsylvania.

At the World Trade Center, 2,763 died after the two planes slammed into the twin towers. That figure includes 343 firefighters and paramedics, 23 New York City police officers and 37 Port Authority police officers who were struggling to complete an evacuation of the buildings and save the office workers trapped on higher floors.

At the Pentagon, 189 people were killed, including 64 on American Airlines Flight 77, the airliner that struck the building. On Flight 93, 44 people died when the plane crash-landed in Pennsylvania.

America Responds to the Attacks

At 7 p.m., President George W. Bush, who was in Florida at the time of the attacks and had spent the day being shuttled around the country because of security concerns, returned to the White House.

At 9 p.m., he delivered a televised address from the Oval Office, declaring, "Terrorist attacks can shake the foundations of our biggest buildings, but they cannot touch the foundation of America. These acts shatter steel, but they cannot dent the steel of American resolve."

In a reference to the eventual U.S. military response he declared, "We will make no distinction between the terrorists who committed these acts and those who harbor them."

Operation Enduring Freedom, the American-led international effort to oust the Taliban regime in Afghanistan and destroy Osama bin Laden's terrorist network based there, began on October 7. Within two months, U.S. forces had effectively removed the Taliban from operational power, but the war continued, as U.S. and coalition forces attempted to defeat a Taliban insurgency campaign based in neighboring Pakistan.

Osama bin Laden, the mastermind behind the September 11th attacks, remained at large until May 2, 2011, when he was finally tracked down and killed by U.S. forces at a hideout in Abbottabad, Pakistan. In June 2011, then-President Barack Obama announced the beginning of large-scale troop withdrawals from Afghanistan; it took until August 2021 for all U.S. forces to withdraw.

Department of Homeland Security Is Created

In the wake of security fears raised by 9/11 and the mailing of letters containing anthrax that killed two and infected 17, The Homeland Security Act of 2002 created the Department of Homeland Security. It was signed into law by President George W. Bush on November 25, 2002. Today, the Department of Homeland Security is a cabinet responsible for preventing terror attacks, border security, immigrations and customs and disaster relief and prevention.

The act was followed two days later by the formation of the National Commission on Terrorist Attacks Upon the United States. The bipartisan " 9/11 Commission," as it came to be known, was charged with investigating the events that lead up to September 11th. The 9/11 Commission Report was released on July 22, 2004. It named Khalid Sheikh Mohammed, the accused mastermind behind 9/11, "the principal architect of the 9/11 attacks."

Mohammed led propaganda operations for al Qaeda from 1999-2001. He was captured on March 1, 2003 by the Central Intelligence Agency and Pakistan's Inter-Services Intelligence and interrogated before being imprisoned in Guantanamo Bay detention camp with four other accused terrorists charged with 9/11-related war crimes. The use of torture, including waterboarding, during Khalid Sheikh Mohammed's interrogation has received international attention. In August 2019, a U.S. military court judge in Guantánamo Bay, Cuba set a trial date for Mohammed and the other four men charged with plotting the 9/11 terrorist attacks to begin in 2021; it was later postponed because of the COVID-19 pandemic.

Economic Impact of 9/11

The 9/11 attacks had an immediate negative effect on the U.S. economy. Many Wall Street institutions, including the New York Stock Exchange, were evacuated during the attacks. On the first day of trading after the attacks, the market fell 7.1 percent, or 684 points. New York City's economy alone lost 143,000 jobs a month and $2.8 billion wages in the first three months. The heaviest losses were in finance and air transportation, which accounted for 60 percent of lost jobs. The estimated cost of the World Trade Center damage is $60 billion. The cost to clean the debris at Ground Zero was $750 million.

Victim Compensation Fund

Thousands of first responders and people working and living in lower Manhattan near Ground Zero were exposed to toxic fumes and particles emanating from the towers as they burned and fell. By 2018, 10,000 people were diagnosed with 9/11-related cancer.

From 2001 to 2004, over $7 billion dollars in compensation was given to families of the 9/11 victims and the 2,680 people injured in the attacks. Funding was renewed on January 2, 2011, when President Barack Obama signed The James Zadroga 9/11 Health and Compensation Act into law. Named for James Zadroga, a New York City Police officer who died of respiratory disease he contracted after rescuing people from the rubble at Ground Zero, the law continued health monitoring and compensation for 9/11 first responders and survivors.

In 2015, funding for the treatment of 9/11-related illness was renewed for five more years at a total of $7.4 billion. The Victim Compensation Fund was set to stop accepting claims in December 2020.

On July 29, 2019, then-President Trump signed a law authorizing support for the September 11 Victim Compensation Fund through 2092. Previously, administrators had cut benefits by up to 70 percent as the $7.4 billion fund depleted. Vocal lobbyists for the fund included Jon Stewart, 9/11 first responder John Feal and retired New York Police Department detective and 9/11 responder Luis Alvarez, who died of cancer 18 days after testifying before Congress.

Anniversary and Memorial

On December 18, 2001, Congress approved naming September 11 "Patriot Day" to commemorate the anniversary of the 9/11 attacks. In 2009, Congress named September 11 a National Day of Service and Remembrance.

The first memorials to September 11 came in the immediate wake of the attacks, with candlelight vigils and flower tributes at U.S. embassies around the world. In Great Britain, Queen Elizabeth sang the American national anthem during the changing of the guard at Buckingham Palace. Rio de Janeiro put up billboards showing the city's Christ the Redeemer statue embracing the New York City skyline.

For the first anniversary of the attacks in New York City in 2002, two bright columns of light were shot up into the sky from where the Twin Towers once stood. The "Tribute in Light" then became an annual installation run by the Municipal Art Society of New York. On clear nights, the beams are visible from over 60 miles away.

A World Trade Center Site Memorial Competition was held to select an appropriate permanent memorial to the victims of 9/11. The winning design by Michael Arad, "Reflecting Absence," now sits outside the museum in an eight-acre park. It consists of two reflecting pools with waterfalls rushing down where the Twin Towers once rose into the sky.

The names of all 2,983 victims are engraved on the 152 bronze panels surrounding the pools, arranged by where individuals were on the day of the attacks, so coworkers and people on the same flight are memorialized together. The site was opened to the public on September 11, 2011, to commemorate the 10-year anniversary of 9/11. The National September 11 Memorial & Museum followed, opening on the original World Trade Center site in May 2014. The Freedom Tower, also on the original World Trade Center site, opened in November 2014.

Sources

"Study Confirms 9/11 Impact on New York City Economy." The New York Times
"September 11: nearly 10,000 people affected by 'cesspool of cancer.'" The Guardian.
"Congress passes 9/11 Victim Compensation Fund extension championed by Jon Stewart." CNN.com
The Encyclopedia of 9/11. New York Magazine.
FAQ About 9/11. 9/11 Memorial.
September 11th Terror Attacks Fast Facts. CNN.
9/11 Death Statistics. StatisticBrain.com.

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September 11 Attacks: Facts, Background & Impact

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On September 11, 2001, 19 militants associated with the Islamic extremist group al Qaeda hijacked four airplanes and carried out suicide attacks against targets in the United States. Two of the planes were flown into the twin towers of the World Trade Center in New York City, a third plane hit the Pentagon just outside Washington, D.C., and the fourth plane crashed in a field in Pennsylvania.

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On October 7, 2001, a U.S.-led coalition begins attacks on Taliban-controlled Afghanistan with an intense bombing campaign by American and British forces. Logistical support was provided by other nations including France, Germany, Australia and Canada and, later, troops were provided by the anti-Taliban Northern Alliance rebels. The invasion of Afghanistan was the opening salvo in the United States "war on terror" and a response to the September 11, 2001, terrorist attacks on New York and Washington, D.C. The conflict in Afghanistan would span two decades and become the longest war in U.S. history.

Dubbed "Operation Enduring Freedom" in U.S. military parlance, the invasion of Afghanistan was intended to target terrorist mastermind Osama bin Laden's al-Qaeda organization, which was based in the country, as well as the extreme fundamentalist Taliban government that had ruled most of the country since 1996 and supported and protected al-Qaeda.

The Taliban, which had imposed its extremist version of Islam on the entire country, also perpetrated countless human rights abuses against its people, especially women, girls and ethnic Hazaras. During their rule, large numbers of Afghans lived in utter poverty, and as many as 4 million Afghans are thought to have suffered from starvation.

In the weeks prior to the invasion, both the United States and the U.N. Security Council had demanded that the Taliban turn over Osama bin Laden for prosecution. After deeming the Taliban's counteroffers unsatisfactory-among them to try bin Laden in an Islamic court-the invasion began with an aerial bombardment of Taliban and al-Qaeda installations in Kabul, Kandahar, Jalalabad, Konduz and Mazar-e-Sharif. Other coalition planes flew in airdrops of humanitarian supplies for Afghan civilians. The Taliban called the actions "an attack on Islam."

After the air campaign softened Taliban defenses, the coalition began a ground invasion, with Northern Alliance forces providing most of the troops and the United States and other nations giving air and ground support. On November 12, a little over a month after the military action began, Taliban officials and their forces retreated from the capital of Kabul. By early December, Kandahar, the last Taliban stronghold, had fallen and Taliban leader Mullah Mohammed Omar went into hiding rather than surrender.

Al-Qaeda fighters continued to hide out in Afghanistan's mountainous Tora Bora region, where they were engaged by anti-Taliban Afghan forces, backed by U.S. Special Forces troops. Al-Qaeda soon initiated a truce, which is now believed to have been a ploy to allow Osama bin Laden and other key al-Qaeda members time to escape into neighboring Pakistan. By mid-December, the bunker and cave complex used by al-Qaeda at Tora Bora had been captured, but there was no sign of bin Laden. Following a 10-year manhunt, bin Laden was finally found and killed in Pakistan by U.S. Navy SEALS on May 2, 2011.

After Tora Bora, a grand council of Afghan tribal leaders and former exiles was convened under the leadership of Hamid Karzai, who first served as interim leader before becoming the first democratically elected president of Afghanistan on December 7, 2004. Even as Afghanistan began to take the first steps toward democracy, however, with more than 10,000 U.S. troops in country, al-Qaeda and Taliban forces began to regroup in the mountainous border region between Afghanistan and Pakistan. Over the next decade-plus, they continued to engage U.S. and Afghan troops in guerilla-style warfare and were also responsible for the deaths of elected government officials and aid workers and the kidnapping of foreigners. Despite a peace agreement signed between the Taliban and U.S. forces in February of 2020, hostilities on both sides continued.

In April of 2021, President Biden -who, like his previous two predecessors, pledged to end the war in Afghanistan-set the deadline of September 11, 2021 as the date of full U.S. withdrawal, with the final drawdown effort to begin in May. By early August of that year, the Taliban began retaking the country. On August 15, 2021, the capital of Kabul fell to Taliban forces and Afghan president Ashraf Ghani fled to the UAE. Following the collapse of the Afghan government and Taliban victory, on August 31, 2021, President Biden declared the war in Afghanistan officially over.

During the 20-year conflict, more than 3,500 allied soldiers were killed, with 20,000-plus Americans injured. Approximately 69,000 Afghan security forces were killed, along with roughly 51,000 civilians and 51,000 militants. According to the United Nations, some 5 million Afghans have been displaced by the war since 2012, making Afghanistan the world's third-largest displaced population.

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On October 7, 2001, a U.S.-led coalition begins attacks on Taliban-controlled Afghanistan with an intense bombing campaign by American and British forces. Logistical support was provided by other nations including France, Germany, Australia and Canada and, later, troops were provided by the anti-Taliban Northern Alliance rebels.