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Archduke killed
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Austria-Hungary declares war on Serbia
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First use of gas as a weapon by the Germans April 1915
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Sinking of the Lusitania
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Wilson reelected; pledged American neutrality
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Zimmerman Note
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U.S declares war
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Bolsheviks led by Lenin overthrow Russian government (November 1917)
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. War ends (November 11, 1918)
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Treaty of Versailles (June 28, 1919