When did the Soviets get an atomic weapon?

The Soviets successfully tested their first nuclear device, called RDS-1 or "First Lightning" (codenamed "Joe-1" by the United States), at Semipalatinsk on August 29, 1949. As the Cold War intensified, both the Soviet Union and the United States embarked upon efforts to rapidly develop and grow their respective nuclear arsenals.

Explanation:

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