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  • April 4, 1949 - The North Atlantic Treaty establishes NATO, a military alliance aimed at protecting Western nations from the Soviet bloc.
  • April 10, 1963 - An American nuclear submarine, Thresher, sinks in the North Atlantic, killing all 129 crewmen.
  • April 11, 1963 - The Vatican releases, the Encyclical Letter Pacem in Terris, by Pope John XXIII, which calls for an end to the nuclear arms race.
  • April 26, 1986 - An uncontrolled surge of power, followed by fire and an explosion, at reactor No. 4 of the Chernobyl Nuclear Power Plant, sends a radioactive cloud around the world.
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