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Assassination of Archduke Franz Ferdinand and his wife in Sarajevo
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The Falaba becomes the first passenger ship sunk by German U-boat
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Second Battle of Ypres: first use of poison gas (Germans)
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The Lusitania is sunk by German U-Boat; 128 American civilians perish
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Battle of Verdun begins (longest battle of the war)
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The Sussex is sunk by German U-Boat; results in the issue of the Sussex Pledge
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Battle of the Somme begins; first use of tanks in combat by British (huge failure)
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U.S. President Woodrow Wilson wins reelection
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Battle of Verdun ends
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The Zimmermann telegram is published in U.S. Newspapers Jan 19
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Germany revokes the Sussex pledge and resumes unrestricted submarine warfare Jan 31
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U.S. breaks off diplomatic relations with Germany
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Tsar Nicolas II abdicates the Russian throne during Russian Revolution mar 15
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U.S. declares war on Germany
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Congress passes the Espionage Act
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Third Battle of Ypres begins; by its end, over 250,000 are dead july 31
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Battle of Cambrai begins;first British offensive designed around use of the tank
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U.S. declares war on Austria-Hungary
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President Wilson makes the “Fourteen Points” speech to Congress
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Russia and Germany sign the Treaty of Brest-Litovsk, removing Russia from the war
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Tsar Nicholas II and his family are murdered by the Bolsheviks
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Kaiser Wilhelm II of Germany abdicates the throne
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Armistice day—fighting ceases at 11 am; over 8.5 million soldiers are dead Nov 11
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Peace negotiations begin in Paris
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The Treaty of Versailles is signed
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U.S. signs separate peace treaty with Hungary
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U.S. signs separate peace treaty with Germany
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U.S. signs separate peace treaty with Austria