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More than 5 American ships sunk by German submarines was one of the reasons that impelled America's intervention in the Great War.
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American's interception of a hidden code that Germany tried to send to Mexico to figh the U.S., thus aliviating America's burden in Europe later.
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President Wilson's points that seeked to solve the long-lasting conflict in Europe among its powerful nations.
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Marked the end of the War the eleventh month, the eleventh day, the eleventh hour, and the eleventh minute in 1918.
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Marked the Prohibition of alcohol in America.
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Accepted women suffrage in all US territories.
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Passed by the US Congress to restrict, for first time in its history, the entrance of foreigners into the nation.