In August 1949, the United States finds itself shocked to discover the Soviet Union has broken Washington's atomic monopoly. The new Soviet bomb was developed quickly, thanks to the acquisition of U.S. atomic secrets by Soviet agents. The bomb also signals the start of the nuclear arms race between the Cold War rivals.

By 1952, the United States develops and tests the first hydrogen bomb. The Soviets match that milestone several years later. Meanwhile, American children watch as bomb shelters are dug in their backyards and learn in school to "duck and cover" should nuclear bombs fall in their neighborhoods.
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