The Union of Soviet Socialist Republics is a state that existed from 1922 to 1991 in Europe and Asia. The USSR occupied 1/6 of the inhabited landmass and was the largest country in the world by area on the territory that by 1917 was occupied by the Russian Empire. The USSR was created on December 30, 1922 by uniting the RSFSR, Ukrainian SSR, BSSR and ZSFSR. The USSR officially ceased to exist on December 26, 1991.
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