jun 9, 1945 - The US drops an atomic bomb on the city of Nagasaki in Japan

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"After [Hiroshima and Nagasaki] Truman demanded a sharp break from past practice. He insisted that a civilian agency, not the military, control access to atomic bombs and their future development. He also proposed, in 1946, turning all such weapons and the means of producing them over to the newly established UN – although under the Baruch Plan the Americans would not relinquish their monopoly until a foolproof system of international inspections was in place." (Gaddis 2006 p. 54)

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