U.S. Marines bombing bunkers and tunnels used by the Viet Cong, 1966.

At the heart of the conflict was the desire of North Vietnam, which had defeated the French colonial administration of Vietnam in 1954, to unify the entire country under a single communist regime modeled after those of the Soviet Union and China. The South Vietnamese government, on the other hand, fought to preserve a Vietnam more closely aligned with the West. U.S. military advisers, present in small numbers throughout the 1950s, were introduced on a large scale beginning in 1961, and active combat units were introduced in 1965. By 1969 more than 500,000 U.S. military personnel were stationed in Vietnam. Meanwhile, the Soviet Union and China poured weapons, supplies, and advisers into the North, which in turn provided support, political direction, and regular combat troops for the campaign in the South. The costs and casualties of the growing war proved too much for the United States to bear, and U.S. combat units were withdrawn by 1973. In 1975 South Vietnam fell to a full-scale invasion by the North.

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The human costs of the long conflict were harsh for all involved. Not until 1995 did Vietnam release its official estimate of war dead: as many as 2 million civilians on both sides and some 1.1 million North Vietnamese and Viet Cong fighters. The U.S. military has estimated that between 200,000 and 250,000 South Vietnamese soldiers died in the war. In 1982 the Vietnam Veterans Memorial was dedicated in Washington, D.C., inscribed with the names of 57,939 members of U.S. armed forces who had died or were missing as a result of the war. Over the following years, additions to the list have brought the total past 58,200. (At least 100 names on the memorial are those of servicemen who were actually Canadian citizens.) Among other countries that fought for South Vietnam on a smaller scale, South Korea suffered more than 4,000 dead, Thailand about 350, Australia more than 500, and New Zealand some three dozen.

Learn about a Vietnamese doctor and her diary of the Vietnam War.

Contunico © ZDF Enterprises GmbH, Mainz

Vietnam emerged from the war as a potent military power within Southeast Asia, but its agriculture, business, and industry were disrupted, large parts of its countryside were scarred by bombs and defoliation and laced with land mines, and its cities and towns were heavily damaged. A mass exodus in 1975 of people loyal to the South Vietnamese cause was followed by another wave in 1978 of “boat people,” refugees fleeing the economic restructuring imposed by the communist regime. Meanwhile, the United States, its military demoralized and its civilian electorate deeply divided, began a process of coming to terms with defeat in what had been its longest and most controversial war. The two countries finally resumed formal diplomatic relations in 1995.

U.S. Pres. George H.W. Bush addressing Congress following Iraq's invasion of Kuwait, 1990.

Courtesy of the George Bush Presidential Library and Museum

The allied coalition’s military offensive against Iraq began on January 16–17, 1991, with a massive U.S.-led air campaign that continued throughout the war. Over the next few weeks, this sustained aerial bombardment, which had been named Operation Desert Storm, destroyed Iraq’s air defenses before attacking its communications networks, government buildings, weapons plants, oil refineries, and bridges and roads. By mid-February the allies had shifted their air attacks to Iraq’s forward ground forces in Kuwait and southern Iraq, destroying their fortifications and tanks.

Operation Desert Sabre, a massive allied ground offensive, was launched northward from northeastern Saudi Arabia into Kuwait and southern Iraq on February 24, and within three days Arab and U.S. forces had retaken Kuwait city in the face of crumbling Iraqi resistance. Meanwhile, the main U.S. armoured thrust drove into Iraq some 120 miles (200 km) west of Kuwait and attacked Iraq’s armoured reserves from the rear. By February 27 these forces had destroyed most of Iraq’s elite Republican Guard units after the latter had tried to make a stand south of Al-Baṣrah in southeastern Iraq. By the time that U.S. President George Bush declared a cease-fire for February 28, Iraqi resistance had completely collapsed.

M1A1 Abrams main battle tanks of the U.S. 1st Armored Division moving across the desert in northern Kuwait during the Persian Gulf War, February 1991.Ssgt. Robert Reeve/U.S. Department of Defense

There are no official figures for the Iraqi military operation. Estimates of the number of Iraqi troops in the Kuwait theatre range from 180,000 to 630,000, and estimates of Iraqi military deaths range from 8,000 to 100,000. The allies, by contrast, lost about 300 troops in the conflict.

Remains of an Iraqi convoy near Kuwait city, Kuwait, during the Persian Gulf War.Peter Turnley/Corbis

The terms of the peace were, inter alia, that Iraq recognize Kuwait’s sovereignty and that it divest itself of all weapons of mass destruction (i.e., nuclear, biological, and chemical weapons) and all missiles with ranges exceeding 90 miles (150 km). Pending complete compliance, economic sanctions would continue.

In the aftermath of Iraq’s defeat, Kurds in the north of the country and Shīʿites in the south rose in a rebellion that was suppressed by Saddam with great brutality. These actions prompted the allies to prohibit Iraqi aircraft from operating in designated “no-fly” zones over these areas. As the other allies gradually left the coalition, U.S. and British aircraft continued to patrol Iraqi skies, and UN inspectors sought to guarantee that all illicit weapons were destroyed. Iraq’s failure to cooperate with inspectors led in 1998 to a brief resumption of hostilities (Operation Desert Fox). Iraq thereafter refused to readmit inspectors into the country, and regular exchanges of fire between Iraqi forces and U.S. and British aircraft over the no-fly zones continued into the 21st century. In 2002 the United States sponsored a new UN resolution calling for the return of weapons inspectors, who then reentered Iraq in November. Member states of the UN Security Council, however, differed in their opinion of the degree to which Iraq had cooperated with inspections. On March 17, 2003, the United States and the United Kingdom, which had begun to mass troops on Iraq’s border, dispensed with further negotiations, and U.S. President George W. Bush—seeking no further UN endorsement—issued an ultimatum demanding that Saddam step down from power and leave Iraq within 48 hours or face war; he even suggested that if Saddam did leave Iraq, U.S. forces might still be necessary to stabilize the region and to hunt for weapons of mass destruction. When Saddam refused to leave, U.S. and allied forces launched an attack on Iraq on March 20 and thus began what became known as the Iraq War.

ARGENTINA-UNITED KINGDOM

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LAST UPDATED: Aug 9, 2018 See Article History

Alternative Titles: Falklands War, Malvinas War, South Atlantic War

Falkland Islands War, also called Falklands War, Malvinas War, or South Atlantic War, a brief undeclared war fought between Argentinaand Great Britain in 1982 over control of the Falkland Islands (Islas Malvinas) and associated island dependencies.
The Outbreak Of Conflict

Argentina had claimed sovereignty over the Falkland Islands, which lie 300 miles (480 km) east of its coast, since the early 19th century, but Britain seized the islands in 1833, expelling the few remaining Argentine occupants, and since then consistently rejected Argentina’s claims. In early 1982 the Argentine military junta led by Lieut. Gen. Leopoldo Galtieri gave up on long-running negotiations with Britain and instead launched an invasion of the islands. The decision to invade was chiefly political: the junta, which was being criticized for economic mismanagement and human rights abuses, believed that the “recovery” of the islands would unite Argentines behind the government in a patriotic fervour. An elite invasion force trained in secrecy, but its timetable was shortened on March 19 when a dispute erupted on British-controlled South Georgia island, where Argentine salvage workers had raised the Argentine flag, 800 miles (1,300 km) east of the Falklands. Naval forces were quickly mobilized.

Argentine troops invaded the Falklands on April 2, rapidly overcoming the small garrison of British marines at the capital Stanley (Port Stanley); they obeyed orders not to inflict any British casualties, despite losses to their own units. The next day Argentine marines seized the associated island of South Georgia. By late April Argentina had stationed more than 10,000 troops on the Falklands, although the vast majority of these were poorly trained conscripts, and they were not supplied with proper food, clothing, and shelter for the approaching winter.

As expected, the Argentine populace reacted favourably, with large crowds gathering at the Plaza de Mayo (in front of the presidential palace) to demonstrate support for the military initiative. In response to the invasion, the British government under Prime Minister Margaret Thatcher declared a war zone for 200 miles (320 km) around the Falklands. The government quickly assembled a naval task force built around two aircraft carriers, the 30-year-old HMS Hermes and the new HMS Invincible light carrier, and two cruise ships pressed into service as troop carriers, the Queen Elizabeth 2 and the Canberra. The carriers sailed from Portsmouth on April 5 and were reinforced en route. Most European powers voiced support for Great Britain, and European military advisers were withdrawn from Argentine bases. However, most Latin American governments sympathized with Argentina. A notable exception was Chile, which maintained a state of alert against its neighbour because of a dispute over islands in the Beagle Channel. The perceived threat from Chile prompted Argentina to keep most of its elite troops on the mainland, distant from the Falklands theatre. In addition, Argentine military planners had trusted that the United States would remain neutral in the conflict, but, following unsuccessful mediation attempts, the United States offered full support to Great Britain, allowing its NATO ally to use its air-to-air missiles, communications equipment, aviation fuel, and other military stockpiles on British-held Ascension Island, as well as cooperating with military intelligence.

On April 25, while the British task force was steaming 8,000 miles (13,000 km) to the war zone via Ascension Island, a smaller British force retook South Georgia island, in the process capturing one of Argentina’s vintage U.S.-made diesel-electric submarines. On May 2 the obsolete Argentine cruiser General Belgrano (purchased from the United States after World War II) was sunk outside the war zone by a British nuclear-powered submarine. Following this controversial event, most other Argentine ships were kept in port, and the Argentine navy’s contribution was limited to its naval air force and one of its newer German-made diesel-electric submarines. The latter posed more of a threat to the British fleet than was expected, launching torpedo attacks that narrowly failed.

Meanwhile, the British naval force and the land-based Argentine air forces fought pitched battles. Argentine aircraft consisted mainly of several dozen old U.S. and French fighter-bombers armed only with conventional high-explosive bombs and lacking electronic countermeasures or radar for acquiring targets. That they proved as effective as they did was a testimony to the skill and motivation of their pilots. In addition, the Argentine navy had recently taken delivery of a few new French-made Super Etendard attack aircraft armed with the newest Exocet antiship missiles; though only a handful in number, these proved particularly deadly. Because the Falklands were at the extreme edge of the Argentine aircraft’s combat radius, the planes could take only one pass at the task force. British ships therefore remained out of range except when closing in to attack Argentine positions.

For the British, the problem was their dependence on two aircraft carriers, as the loss of one would almost certainly have forced withdrawal. Air cover was limited to perhaps 20 short-range Sea Harrier naval jets armed with air-to-air missiles. To make up for the lack of long-range air cover, a screening force of destroyers and frigates was stationed ahead of the fleet to serve as radar pickets. However, not all of them were armed with full antiaircraft systems or close-in weapons for shooting down incoming missiles. This left the British ships vulnerable to attack, and on May 4 the Argentines sank the destroyer HMS Sheffieldwith an Exocet missile. The Argentines, meanwhile, lost some 20–30 percent of their planes.

Thus weakened, the Argentines were unable to prevent the British from making an amphibious landing on the islands. Apparently expecting a direct British assault, the Argentine ground-forces commander, Gen. Mario Menéndez, centralized his forces around the capital of Stanley to protect its vital airstrip. Instead, the British navy task-force commander, Rear Adm. John Woodward, and the land-force commander, Maj. Gen. Jeremy Moore, decided to make their initial landing near Port San Carlos, on the northern coast of East Falkland, and then mount an overland attack on Stanley. They calculated that this would avoid casualties to the British civilian population and to the British forces.

The British landed unopposed on May 21, but the Argentine defenders, some 5,000 strong, quickly organized an effective resistance, and heavy fighting was required to wear it down. The Argentine air forces, meanwhile, kept up their attacks on the British fleet, sinking two frigates, a destroyer, a container ship carrying transport helicopters, and a landing ship disembarking troops. In addition, they damaged several other frigates and destroyers. Nevertheless, they were not able to damage either aircraft carrier or sink enough ships to jeopardize British land operations. They also lost a considerable portion of their remaining jets as well as their Falklands-based helicopters and light ground-attack planes.

From the beachhead at Port San Carlos, the British infantry advanced rapidly southward, through forced marches under extremely adverse weather conditions, to capture the settlements of Darwin and Goose Green. After several days of hard fighting, some of it hand-to-hand, against determined Argentine troops dug in along several ridgelines, the British succeeded in taking and occupying the high ground west of Stanley. With British forces surrounding and blockading the capital and main port, it was clear that the large Argentine garrison there was cut off and could be starved out. Menéndez therefore surrendered on June 14, effectively ending the conflict. British forces removed a small Argentine garrison from one of the South Sandwich Islands, some 500 miles (800 km) southeast of South Georgia, on June 20.

The British captured some 11,400 Argentine prisoners during the war, all of whom were released afterward. Argentina announced that about 650 lives had been lost—about half of them in the sinking of the General Belgrano—while Britain lost 255. Military strategists have debated key aspects of the conflict but have generally underscored the roles of submarines (both Britain’s nuclear-powered vessels and Argentina’s older, diesel-electric craft) and antiship missiles (both air-to-sea and land-to-sea types). The war also illustrated the importance of air superiority—which the British had been unable to establish—and of advanced surveillance. Logistic support was vital as well, because the armed forces of both countries had operated at their maximum ranges. (See also naval warfare: The age of the guided missile.)

Argentina’s military government was severely discredited by its failure to prepare and support its own military forces in the invasion that it had ordered, and civilian rule was restored to Argentina in 1983. Meanwhile, British Prime Minister Margaret Thatcher converted widespread patriotic support into a landslide victory for her Conservative Party in the parliamentary election of 1983.

1939–1945

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LAST UPDATED: Aug 27, 2018 See Article History

Alternative Titles: Second World War, WWII

World War II, also called Second World War, conflict that involved virtually every part of the world during the years 1939–45. The principal belligerents were the Axis powers—Germany, Italy, and Japan—and the Allies—France, Great Britain, the United States, the Soviet Union, and, to a lesser extent, China. The war was in many respects a continuation, after an uneasy 20-year hiatus, of the disputes left unsettled by World War I. The 40,000,000–50,000,000 deaths incurred in World War II make it the bloodiest conflict, as well as the largest war, in history.

In the Battle of Stalingrad (1942–43), the advancing Germans were finally stopped by the Red Army in desperate house-to-house fighting. From The Second World War: Allied Victory (1963), a documentary by Encyclopædia Britannica Educational Corporation.

Encyclopædia Britannica, Inc.

Along with World War I, World War II was one of the great watersheds of 20th-century geopolitical history. It resulted in the extension of the Soviet Union’s power to nations of eastern Europe, enabled a communist movement to eventually achieve power in China, and marked the decisive shift of power in the world away from the states of western Europe and toward the United States and the Soviet Union.

A gigantic mushroom cloud rising above Hiroshima, Japan, on August 6, 1945, after a U.S. aircraft dropped an atomic bomb on the city, immediately killing more than 70,000 people.

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20th-century international relations: World War II, 1939–45

By the early part of 1939 the German dictator Adolf Hitler had become determined to invade and occupy Poland. Poland, for its part, had guarantees of French and British military support should it be attacked by Germany. Hitler intended to invade Poland anyway, but first he had to neutralize the possibility that the Soviet Union would resist the invasion of its western neighbour. Secret negotiations led on August 23–24 to the signing of the German-Soviet Nonaggression Pact in Moscow. In a secret protocol of this pact, the Germans and the Soviets agreed that Poland should be divided between them, with the western third of the country going to Germany and the eastern two-thirds being taken over by the U.S.S.R.

Soviet foreign minister Vyacheslav Molotov, having negotiated the German-Soviet Nonaggression Pact of August 1939, is greeted by German foreign minister Joachim von Ribbentrop and other officials in Berlin. From “The Second World War: Prelude to Conflict” (1963), a documentary by Encyclopædia Britannica Educational Corporation.Encyclopædia Britannica, Inc.

Having achieved this cynical agreement, the other provisions of which stupefied Europe even without divulgence of the secret protocol, Hitler thought that Germany could attack Poland with no danger of Soviet or British intervention and gave orders for the invasion to start on August 26. News of the signing, on August 25, of a formal treaty of mutual assistance between Great Britain and Poland (to supersede a previous though temporary agreement) caused him to postpone the start of hostilities for a few days. He was still determined, however, to ignore the diplomatic efforts of the western powers to restrain him. Finally, at 12:40 PM on August 31, 1939, Hitler ordered hostilities against Poland to start at 4:45 the next morning. The invasion began as ordered. In response, Great Britain and France declared war on Germany on September 3, at 11:00 AMand at 5:00 PM, respectively. World War II had begun.

Overview of the German invasion of Poland (1939), which marked the beginning of World War II.

Contunico © ZDF Enterprises GmbH, Mainz

In September 1939 the Germans overrun Poland, forcing all of Europe into a state of war. From “The Second World War: Prelude to Conflict” (1963), a documentary by Encyclopædia Britannica Educational Corporation.

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1914–1918

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LAST UPDATED: Aug 13, 2018 See Article History

Alternative Titles: First World War, Great War, WWI

World War I, also called First World War or Great War, an international conflict that in 1914–18 embroiled most of the nations of Europe along with Russia, the United States, the Middle East, and other regions. The war pitted the Central Powers—mainly Germany, Austria-Hungary, and Turkey—against the Allies—mainly France, Great Britain, Russia, Italy, Japan, and, from 1917, the United States. It ended with the defeat of the Central Powers. The war was virtually unprecedented in the slaughter, carnage, and destruction it caused.

World War I was one of the great watersheds of 20th-century geopolitical history. It led to the fall of four great imperial dynasties (in Germany, Russia, Austria-Hungary, and Turkey), resulted in the Bolshevik Revolution in Russia, and, in its destabilization of European society, laid the groundwork for World War II.

With Serbia already much aggrandized by the two Balkan Wars (1912–13, 1913), Serbian nationalists turned their attention back to the idea of “liberating” the South Slavs of Austria-Hungary. Colonel Dragutin Dimitrijević, head of Serbia’s military intelligence, was also, under the alias “Apis,” head of the secret society Union or Death, pledged to the pursuit of this pan-Serbian ambition. Believing that the Serbs’ cause would be served by the death of the Austrian archduke Franz Ferdinand, heir presumptive to the Austrian emperor Franz Joseph, and learning that the Archduke was about to visit Bosnia on a tour of military inspection, Apis plotted his assassination. Nikola Pašić, the Serbian prime minister and an enemy of Apis, heard of the plot and warned the Austrian government of it, but his message was too cautiously worded to be understood.

Overview of the start of World War I, including details of the June 28, 1914, assassination of Archduke Franz Ferdinand.

Contunico © ZDF Enterprises GmbH, Mainz

Europeans were fighting heavily on two fronts before the U.S. entered the war in 1917.

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At 11:15 AM on June 28, 1914, in the Bosnian capital, Sarajevo, Franz Ferdinand and his morganatic wife, Sophie, duchess of Hohenberg, were shot dead by a Bosnian Serb, Gavrilo Princip. The chief of the Austro-Hungarian general staff, Franz, Graf (count) Conrad von Hötzendorf, and the foreign minister, Leopold, Graf von Berchtold, saw the crime as the occasion for measures to humiliate Serbia and so to enhance Austria-Hungary’s prestige in the Balkans. Conrad had already (October 1913) been assured by William II of Germany’s support if Austria-Hungary should start a preventive war against Serbia. This assurance was confirmed in the week following the assassination, before William, on July 6, set off upon his annual cruise to the North Cape, off Norway.

Austrian Archduke Franz Ferdinand and his wife, Sophie, riding in an open carriage at Sarajevo shortly before their assassination, June 28, 1914.

World History Archive/ARPL/age fotostock

The Austrians decided to present an unacceptable ultimatum to Serbia and then to declare war, relying on Germany to deter Russia from intervention. Though the terms of the ultimatum were finally approved on July 19, its delivery was postponed to the evening of July 23, since by that time the French president, Raymond Poincaré, and his premier, René Viviani, who had set off on a state visit to Russia on July 15, would be on their way home and therefore unable to concert an immediate reaction with their Russian allies. When the delivery was announced, on July 24, Russia declared that Austria-Hungary must not be allowed to crush Serbia.

Serbia replied to the ultimatum on July 25, accepting most of its demands but protesting against two of them—namely, that Serbian officials (unnamed) should be dismissed at Austria-Hungary’s behest and that Austro-Hungarian officials should take part, on Serbian soil, in proceedings against organizations hostile to Austria-Hungary. Though Serbia offered to submit the issue to international arbitration, Austria-Hungary promptly severed diplomatic relations and ordered partial mobilization.

Home from his cruise on July 27, William learned on July 28 how Serbia had replied to the ultimatum. At once he instructed the German Foreign Office to tell Austria-Hungary that there was no longer any justification for war and that it should content itself with a temporary occupation of Belgrade. But, meanwhile, the German Foreign Office had been giving such encouragement to Berchtold that already on July 27 he had persuaded Franz Joseph to authorize war against Serbia. War was in fact declared on July 28, and Austro-Hungarian artillery began to bombard Belgrade the next day. Russia then ordered partial mobilization against Austria-Hungary, and on July 30, when Austria-Hungary was riposting conventionally with an order of mobilization on its Russian frontier, Russia ordered general mobilization. Germany, which since July 28 had still been hoping, in disregard of earlier warning hints from Great Britain, that Austria-Hungary’s war against Serbia could be “localized” to the Balkans, was now disillusioned insofar as eastern Europe was concerned. On July 31 Germany sent a 24-hour ultimatum requiring Russia to halt its mobilization and an 18-hour ultimatum requiring France to promise neutrality in the event of war between Russia and Germany.

Both Russia and France predictably ignored these demands. On August1 Germany ordered general mobilization and declared war against Russia, and France likewise ordered general mobilization. The next day Germany sent troops into Luxembourg and demanded from Belgiumfree passage for German troops across its neutral territory. On August 3 Germany declared war against France.

In the night of August 3–4 German forces invaded Belgium. Thereupon, Great Britain, which had no concern with Serbia and no express obligation to fight either for Russia or for France but was expressly committed to defend Belgium, on August 4 declared war against Germany.

Austria-Hungary declared war against Russia on August 5; Serbia against Germany on August 6; Montenegro against Austria-Hungary on August 7 and against Germany on August 12; France and Great Britain against Austria-Hungary on August 10 and on August 12, respectively; Japanagainst Germany on August 23; Austria-Hungary against Japan on August 25 and against Belgium on August 28.

Romania had renewed its secret anti-Russian alliance of 1883 with the Central Powers on February 26, 1914, but now chose to remain neutral. Italy had confirmed the Triple Alliance on December 7, 1912, but could now propound formal arguments for disregarding it: first, Italy was not obliged to support its allies in a war of aggression; second, the original treaty of 1882 had stated expressly that the alliance was not against England.

On September 5, 1914, Russia, France, and Great Britain concluded the Treaty of London, each promising not to make a separate peace with the Central Powers. Thenceforth, they could be called the Allied, or Entente, powers, or simply the Allies.

The outbreak of war in August 1914 was generally greeted with confidence and jubilation by the peoples of Europe, among whom it inspired a wave of patriotic feeling and celebration. Few people imagined how long or how disastrous a war between the great nations of Europe could be, and most believed that their country’s side would be victorious within a matter of months. The war was welcomed either patriotically, as a defensive one imposed by national necessity, or idealistically, as one for upholding right against might, the sanctity of treaties, and international morality.