Joseph Stalin succeeded Vladimir Lenin and became leader of the Soviet Union.
The Soviet Union which was officially known as the Union of Soviet Socialist Republics(USSR), was a communist state that existed in Europe and Asia from 1922 to 1991.
It was seen as a federal union of multiple national republics but in reality its government and economy were highly centralized until its final years.
The Soviet Union disintegrated in 1991 to birth several smaller nations.
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