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The Platt amendment is passed in the US congress, lining out what the US will do with Cuba.
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The Boy Scouts of America are created.
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Woodrow Wilson is elected president of the United States, won on a split ticket between Taft, Wilson and Theodore Roosevelt
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Archduke Franz Ferdinand was assassinated on a trip to Sarajevo, Austria-Hungary. (Modern day Bosnia & Herzegovina)
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"The war to end all wars." Most deadly war of the time.
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A German U-Boat sank the Lusitania, killing Americans, and enraging the US populace.
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The Zimmerman Telegraph is sent to Mexico and is intercepted by the United Kingdom. The contents of the letter was the turning point for America's decision to join World War One
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America declares war on The German Empire
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While passed in December of 1917, the 18th amendment was ratified by 3/4 of the US States. Prohibition had begun.
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The most famous WW1 treaty, The Treaty of Versailles was signed by Germany.
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The primary antagonist of the United States was formally established.