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Washington Conference on arms reduction successfully reduces the size of the US, British, Japanese, French and Italian fleets. The participants agree on a tonnage-ration of 5:5:3:1,75:1,75 and not to build any new capital ships. The "Open door policy" for China is concluded.
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Teapot Dome scandal breaks, as Senate launches an investigation into improper leasing of naval oil reserves during Harding administration.
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President Harding dies suddenly. He is succeeded by his vice president, Calvin Coolidge.
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The Stock Market Crash of 1929 marked the beginning of the Great Depression. It caused the suicides of many Wall Street businessmen, and threw many United States families into poverty as investments became worthless.
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Hattie Wyatt Caraway of Arkansas is the first woman elected to the U.S. Senate, to fill a vacancy caused by the death of her husband. She is reelected in 1932 and 1938.
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Twentieth Amendment to the Constitution, sometimes called the “Lame Duck Amendment,” is ratified, moving the president's inauguration date from March 4 to Jan. 20.
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Twenty-First Amendment to the Constitution is ratified, repealing Prohibition.
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Bureau of Investigation (established 1908) becomes the Federal Bureau of Investigation under J. Edgar Hoover
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Fair Labor Standards Act is passed, setting the first minimum wage in the U.S. at 25 cents per hour.
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F. Roosevelt's third inauguration. He is the first and only president elected to a third term
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Japan attacks Hawaii, Guam, and the Philippines
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Germany and Italy declare war on the United States; U.S. reciprocates by declaring war on both countries.