April 24, 1800 President John Adams signs legislation establishing the Library of Congress.
April 25, 1990 Space Shuttle Discovery releases the Hubble Space Telescope into orbit.
April 26, 1986 A reactor at the Soviet nuclear plant in Chernobyl explodes, spewing deadly radiation.
April 28, 1967 Boxing champion Muhammad Ali refuses induction into the U.S. Army.
April 30, 1803 The United States and France conclude negotiations on the Louisiana Purchase, which doubles the size of the United States.
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