March 13 (UPI) -- On this date in history: In 1781, the planet Uranus was discovered by British astronomer William Herschel. In 1868, the Republican-dominated U.S. Senate began impeachment proceedings against U.S. President Andrew Johnson, a Democrat and successor to Abraham Lincoln, climaxing a political feud following the Civil War. He was acquitted by one vote. In 1881, Czar Alexander II, the ruler of Russia since 1855, was killed in a St. Petersburg street by a bomb thrown by a member of

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