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The United States adopts the Gold Standard.
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Theodore Roosevelt becomes President of the United States.
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The Panama Canal is built.
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Woodrow Wilson is elected as the President of the United States.
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The Sixteen Amendment authorizing income tax is ratified.
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WWI begins.
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The Lusitania is sunk. This causes the American public to favor war.
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The U.S. joins WWI.
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WWI comes to a close and the Treaty of Versailles is signed
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The Red Scare begins.
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The Nineteenth Amendment gives women the right to vote is ratified.