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The assassination of the Archduke of Austria-Hungary caused the beginning of World War I
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After the assassination of Archduke Franz Ferdinand and his wife Austria-Hungary urged the government to declare war on Serbia, starting WWI.
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German forces shocked French troops in Ypres, Belgium when they began firing 150 tons of chlorine gas.
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On May 7, 1915 a German U-Boat torpedoed the RMS Lusitania which led to its sinking. 1198 people were killed, and this disaster is one main reason U.S. got int he war.
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When wilson was reelected in November he pledged America would stay neutral.
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The Zimmerman Note is a note sent by Arthur Zimmerman asking Mexico that if U.S. entered the war that they would attack the U.S.
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On April 2,1917 U.s. declares war on Germany after the U-Boat Attacks and Zimmerman Note.
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Vladimir Lenin overthrow the Russian government and set up a Provisional Government, that decides to pull out of the war.
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After Germany agrees to all of U.S.' terms the war is officially over.
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