1945  
June 26 The United Nations Charter is signed in San Francisco.
July 16 “Trinity,” the first nuclear device, is exploded at Alamogordo, New Mexico. The test ushers in the atomic age.
August 6 and 9 Hiroshima and Nagasaki are bombed, killing and injuring hundreds of thousands of people.
1949  
August 29 Soviet Union detonates a nuclear device.
1950  
January 31 President Truman approves a program to build the hydrogen bomb.
1954  
March 1 Hydrogen-bomb test Bravo at the Bikini Atoll irradiates twenty-three-man crew of Japanese fishing vessel Lucky Dragon, eighty-five miles away. The explosion is equivalent to a thousand Hiroshima bombs. The event rouses dread around the world and helps launch a global campaign to end ...

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