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McKinley's is shot by anarchist Leon Czolgosz in Buffalo, N.Y.
He later dies from his wounds and is succeeded by his vice president, Theodore Roosevelt. -
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The seventeenth Amendment to the Constitution is ratified, providing for the direct election of U.S. senators by popular vote rather than by the state legislatures.
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First long-distance telephone service, between New York and San Francisco, is demonstrated.
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The U.S. agrees to purchase Danish West Indies (Virgin Islands) for $25 million.
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Jeannette Rankin of Montana is the first woman elected to the U.S. House of Representatives.
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U.S. enters World War I, declaring war on Germany and Austria-Hungary.
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League of Nations meets for the first time, the United States is not represented.
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The eighteenth amendment to the Constitution is ratified, prohibiting the manufacture, sale, and transportation of liquor. It is later repealed by the Twenty-First Amendment in 1933.
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The Nineteenth Amendment to the Constitution is ratified, granting women the right to vote.
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Treaty of Versailles, outlining terms for peace at the end of World War I, is rejected by the Senate.