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World War I quickly became a total war, meaning countries devoted all resources for the war effort. Governments like in Germany, dedicated themselves to win battles. They took over the economy and controlled factory's production. Because of this, the Allied powers needed factors like crucial contribution to win both wars. This gave them war effort, producing weapons and equipment that would support them in war.

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Archduke Dranz Ferdinand, the heir of the Austro-Hungarian throne, was killed by a Serbian and member of the black hand. This led to Austria giving Serbia a ultimatum which contained many demands.Serbian leaders agreed to most terms but wanted to negotiate. Austria did not want to negotiate later declaring war on them. Russian's later then got involved because they were allied to the Serbians. Later then many European powers joined in the conflict including the British and the Italian government.

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Hitler moved ahead with conquering Poland after signing the nonaggression pact with Germany. This later caused France and Britain to declare war on Germany because they were violating the Treaty of Versailles. Poland later fell before these nations could make any military response. After Hitler declared victory, Hitler annexed western Poland.

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Tactics

Trench warfare: Soldiers would fight each other through trenches.

Artillery fire: Heavy military ranged weapons built to launch munitions far beyond the range and power of infantry firearms.

Weaponry

Machine Guns: This was a portable and automatic gun  that fired hundreds of shots.

Poison Gas: This weapon was used on solider that were in trenches, causing suffocation, Blister skin, or blindness.

Tanks: This was large vehicle that had mass amounts of armor and was equipped with machine guns or canons

Submarines: A watercraft fighting machine that can fight under water and do independent missions.

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Tactics

Blitzkrieg "Lighting war": This tactic was used to gain/take large amounts of land by using fast moving planes and tanks, followed by massive infantry force,  to take enemy defenders by surprise and quickly overwhelmed them.

Weapon's

German ME 262 " The first ever used military jet plan which was acquired by the Germans during World War 2.

Atomic Bomb " The United States were the first to use Atomic bombs. They were used on the cities of Hiroshima and Nagasaki causing massive amount of damage and releasing radioactive particles.

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The Treaty of Versailles was a treaty between Germany and the Allied powers, it was signed on June 28, 1919. The treaty created a league of Nations. Which was a international association whose goal is keep peace among nations and it punish Germany. The Versailles treaty was one of five treaties negotiated by the Allies. But instead of creating peace it  created feelings of bitterness and betrayal among the victor and the defeat. United State rejected the treaty since they thought that the best way to be in peace is to stay away from European affairs. Later United  States worked out a separate treaty with Germany and its allies several years later.

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nationalism is when someone is very interested in and support their nation. you can say nationalism is patriotism. an example of how nationalism was a factor in the cause of the wars is Hitler. Hitler went against the Treaty Of Versailles due to him believing that the treaty went against German power which he supported greatly.

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imperialism is when a country chooses to expand by military force or through diplomacy. examples of imperialism that set the stage for the great wars, was the invasion of Manchuria and China.

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In between wars, it disrupted traditional social patterns, like new ideas and ways of life of individual freedom. The war opened opportunities for women such as voting, new careers in professions like medicine, education and journalism.

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WW2: In June 1945, the United States and the soviet union temporarily set aside their differences . They joined 48 other countries in forming the United Nations. It was made to protect the members against aggression. US idea of punishing specific criminals while aiding its former enemies was different that the Treaty of Versailles because in the treaty of Versailles wanted peace while US was different since they were gonna be peaceful but by aiding Europe and putting criminals at trial instead on blaming all in one country.

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The Central Powers involved in World War I were Germany, Austria, and the Ottoman Empire. The Allied powers involved were France, Serbia, Russia and the United Kingdom (Ireland & Great Britain).

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The great Influenza pandemic of 1918-1919, often called the Spanish flu, caused 20-50 million deaths worldwide. Influenza was an unprecedented deadly virus which claimed the lives of many people, this was due  to the lack of resources. The Spanish flu originated in England and India and spread through trade routes and war shipments. These war shipments contained machinery and useful supplies to soldiers. As men across the nation were mobilizing to join the army and came together, they brought the virus with them and to those they contacted. This led to a rapid spread of Influenza in other parts of the world like Europe, Russia, Asia, and the United States. Influenza also had a major impact on the war itself, Entire fleets of soldiers were ill with the disease and men on the front were too sick to fight.
Nevertheless, the great war had devastating economic and environmental  issues. For example the war came to $338 billion and the destruct of many homes, villages, towns, and farmlands.

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World War 2  was devastating to Europe. Close to 40-million Europeans had died, two thirds of them civilians. Constant bombing and shelling had reduced hundreds of cities to rubble. The ground war had destroyed much of the countryside. Displaced persons from many nations were left homeless.

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Both World Wars involved the brutal act of genocide. World War One targeted a particular race (Armenians) while World War 2 targeted a specific religion (Jews). Both genocides used similar punishments to their targeted victims like separating them from their love ones and make them do forced labor.

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Militarism is a desire that a government and or country needs a strong military that needs to be prepared to fight or promote national interests. militarism was used before the great wars by the nations of Europe, and was later on used by other country's.

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These nations changed as World War II took place. The Axis Powers (bad guys) included France, Italy, Germany, Austria, part of the Soviet Union, North Africa and Asia. The Allied Powers (good guys) included the United Kingdom, Egypt, Australia, China, India and part of Soviet Union.

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Japan planned massive attacks on British and Dutch Colonies in Southeast Asia and on American outposts in the Pacific. This made it so they caught European colonial powers and United States by surprise. Admiral Isoroku Yamamoto, Japans greatest naval strategist, also called for an attack on the U.S. fleet in Hawaii. He said it was "a dagger pointed at Japan's throat and must be destroyed." On December 7, 1941 Pearl Harbor was attacked and ultimately destroyed.

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the concept of alliances was to keep peace between two or more country's. some upsides to alliances was the fact that country's got more protection and stronger military. the downsides to alliances is that at any moment someone can break them and cause pure chaos.