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Archduke Franz Ferdinand and his wife were assassinated while visiting Sarajevo, Bosnia. He was next in line for the Austro-Hungarian throne. The killings set off decades of old tensions in Europe and started WWI.
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The Lusitania was a British passenger liner. On May 7, 1915 the Lusitania was torpedoed by a German U-boat. 1,000 people died when the liner sank 128 of whom were Americans. The sinking of the Lusitania was the first thing that pushed America's buttons.
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Woodrow Wilson decided that America would stay neutral in WWI, at least at the beginning, because it didn't last.
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The Zimmermann Note/ Telegram was a secret diplomatic communication that was issued from the Germany Foreign Office which proposed an alliance of military between Germany and Mexico.
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On April 2, 1917 President Wilson decided America couldn't stay neutral in the war anymore. On April 6 of the same year Congress passed a declaration of war. On May 18th Congress passed the Selective Service Act, drafting men into the military.
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President Wilson decided that the U.S couldn't stay neutral in the war anymore as the other countries kept pushing their buttons. (Sinking the Sussex and Lusitania)
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Because Germany struggled on the Western Front and their allies were loosing (Ottoman Empire and Austria-Hungary) the two allies surrendered to the Allied Powers
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The Treat of Versailles was a treaty between the Allies and Germany signed on June 28, 1919. Germany had to accept all the responsibility for the conflict under it's terms. Germany had to pay for the Allies billions of dollars, and disarm completely, give up oversea colonies and some territory in Europe.
