The Soviet Union detonated its first atomic bomb on August 29, 1949, at the Semipalatinsk Test Site in Kazakhstan. The event ended America's monopoly on atomic weaponry and launched the Cold War.


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The Soviet Union detonated its first atomic bomb on August 29, 1949, at the Semipalatinsk Test Site in Kazakhstan. The event ended America's monopoly on atomic weaponry and launched the Cold War.