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Nations enforced mandatory military service to create and sustain their armies. Drafting people expanded the wars reach.

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The belief in military forces that is essential for National success. This belief led to the desire for war.

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Woodrow Wilsons plan for peace after the war. This plan was used to prevent future wars and to promote diplomacy.

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Wars were fought in dugout trenches. Poor hygiene conditions led to disease and death

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Europeans divided into colonies, which caused tension over resources and territory.

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An international organization created to maintain world peace after World War 1. The US did not join the Leage of Nations, which prevented world peace.

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A deadly chemical weapon used to break through enemy lines. Poison Gas was used by both sides, but became less effective after the creation of gas masks.

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Competing blocks between countries were formed when nations separated into military alliances. World war was made because the Triple Alliances brought other countries into war due to alliance duties.

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A treaty in 1919 that ended World War 1, and negatively impacted Germany. Germany had to pay heavy reparations and lose territory.

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Machine guns are rapid fire weapons that significantly changed warfare. The use of machine guns let to a higher number of casualties in the war.

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Nationalist movements led to desire for pride in individual nations, which caused conflict in multi-ethnic empires. The assassination of Archduke due to Serbian nationalism led to the starting of the war.

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Instead of independence, former territories of Germany and Ottomans were placed under the control of Europe. This expanded European colonialism which created tensions in parts of Africa.

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Submarines are underwater boats that changed the war through strategy and discreteness. Germany Submarine warfare pushed the US to join the World War.

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Gavrilo Princip was the Serbian nationalist who killed the Archduke. The assassination began a war on Serbia which led to the start of WW1.

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Airplanes were initially used for airborne scouting, but eventually were used in battle. Aerial Combat (air warfare) was introduced, but was limited do to the fact that it was a new concept.

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Archduke was the King of Austria who was assassinated. After the assassination, war was declared on Serbia, which started World War 1.

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Tanks are a British creation that was made to break through trenches during World War 1.

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Total War is a war strategy where all of society was involved in the war efforts of World War 1.

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Government controlled the media to shape public perceptions. Propaganda was used to demonize the enemies and justify warfare.