W. D. Boyce incorporates the Boy Scouts of America on February 8, 1910.
Fire kills 146 workers at the Triangle Shirtwaist Factory, on March 25, 1911.
Arizona becomes the 48th state and last of the contiguous states admitted to the Union on February 14, 1912.
HMS Titanic strikes an iceberg on April 14, 1912.
Jim Thorpe, and American Indian from Oklahoma's Fox and Sac Nation, wins gold medals in the pentathalon and decathalon during the 1912 Olympic Games.
Willa Cather publishes O Pioneers! in 1913.
The Panama Railway steamship "SS Ancon," made the first official transit of the Panama Canal on August 15, 1914.
President Woodrow Wilson signs the Jones-Shafroth Act on March 2, 1917, establishing the right of U.S. citizenship to residents of Puerto Rico.
On April 6, 1917, the U.S. Congress declares war on Germany, marking America's entry into World War I.
The Eighteenth Amendment to the U.S. Constitution is ratified on January 16, 1919, prohibiting the "manufacture, sale, or transportation of intoxicating liquors" in the United States. "Prohibition" would be repealed in 1933.
Eight members of the Chicago White Sox are eventually banned for life from baseball after convictions for intentionally losing games, allowing the Cincinnati Reds to win the 1919 World Series.
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