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The assassination of Archduke Franz Ferdinand instigated the beginning of World War I.
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Austria-Hungary was so extremely angry about the assassination of the Archduke and his wife, so the next month they declared war on Serbia.
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The Germans introduced poisonous gases to the battle field which could kill or seriously injure anyone who breathed it. The first gas masks didn't work so they were modified very quickly and soon every soldier who saw combat wore a gas mask during the war.
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The Lusitania sinking caused Wilson to want to get into the war because the news in the newspapers caused the public to put pressure on him.
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Wilson was reelected the president with the slogan "He Kept Us Out Of War" because he is trying to keep the U.S. neutral in WWI, but it was a very close election between him and republican candidate Charles Evans Hughes.
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The Zimmermann Note was a telegram from Arthur Zimmermann to Mexico about Mexico and Germany invading America and trying to capture three of America's states; Texas, New Mexico and Arizona, but the telegram was intercepted and decoded by the British who informed President Wilson.
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At that point America was shocked about what Germany was doing to the U.S. when the U.S. wasn't even in the war. The Germans sank their merchant ships, The Lusitania and had even planned to help Mexico invade America and take three of its states, so they declared war on Germany.
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Czar Nicholas II gave up his position as ruler of Russia in Russia's first revolution where a group of people called the Bolsheviks led by Vladimir Lenin overthrew the government.The Bolsheviks did not want to stay in the war so they signed the treaty of Brest-Litovsk with Germany.
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The Allied Powers had won the war because of some major battle wins like the Battle of Argonne Forrest and because the Austria-Hungarian empire was collapsing. Germany was soon beginning to realize that there was no hope of winning the war anymore, so they asked President Wilson for an armistice.
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The treaty between the Allied Powers and Germany after WWI. Under its terms Germany had to take full responsibility for the conflict , give the Allies billions of dollars, had to disarm themselves completely, and had to give up some territory in Europe and all of its oversea colonies. The treaty carved up the Austro-Hungarian and Russian empires. The treaty created new nations restored new nations and Wilson was able to get his League of Nations included in the treaty as well.
