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US POP. exceeds 75 million
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The United States Senate accepts the Anglo-German treaty of 1899, in which the United Kingdom renounces its claims to the Samoan islands.
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Brigham H. Roberts is refused a seat in the United States House of Representatives because of his polygamy.
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The American League of Professional Baseball Clubs is organized in Philadelphia, Pennsylvania with 8 founding teams.
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U.S. presidential election, 1900: Republican incumbent William McKinley is reelected by defeating Democratic challenger William Jennings Bryan.
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In the first great Texas gusher, oil is discovered at Spindletop in Beaumont, Texas.
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Baseball's American League declares itself a Major League.
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The National Association of Professional Baseball Leagues (later renamed Minor League Baseball) is formed in Chicago.
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Theodore Roosevelt succeeds William McKinley as President of the United States.
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Michigan schoolteacher Annie Taylor goes down Niagara Falls in a barrel and survives.
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The first college football bowl game, the Rose Bowl between Michigan and Stanford, is held in Pasadena, California.
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The first modern World Series pits the National League's Pittsburgh against Boston of the American League.
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The first large-scale bodybuilding competition in America takes place at Madison Square Garden in New York City.
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Pitching against the Philadelphia Athletics, Cy Young of the Boston Americans throws the first perfect game in the modern era of baseball.
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Indian Territory and Oklahoma Territory become Oklahoma, which is admitted as the 46th U.S. state
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The United States Army formally adopts the M1911 pistol as its standard sidearm.
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Southern Methodist University is chartered.
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Groundbreaking for Fenway Park in Boston, Massachusetts, begins
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Chevrolet officially enters the automobile market to compete with the Ford Model T.
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New Mexico is admitted as the 47th U.S. stat
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Arizona is admitted as the 48th U.S. state
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The Girl Scouts of the USA are founded.
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U.S. Marines land in Cuba.
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The 16th Amendment to the United States Constitution is ratified
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The Great Lakes Storm of 1913 kills more than 250
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The Federal Reserve is created by Woodrow Wilson
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Tampico Affair, involving U.S. Navy sailors in Mexico
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The baseball stadium Weeghman Park, later known as Wrigley Field, opens in Chicago.
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Woodrow Wilson signs a Mother's Day proclamation
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Baseball legend Babe Ruth makes his major league debut with the Boston Red Sox
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The last known passenger pigeon "Martha" dies in the Cincinnati Zoo
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The Rocky Mountain National Park is established by an act of the U.S. Congress
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NACA, the predecessor of NASA, is founded
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Babe Ruth hits his first career home run off of Jack Warhop
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The United States occupation of Haiti begins
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The United States Marine Corps take control of Santo Domingo