How was the Soviet Union established?
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On December 29, 1922, a conference of plenipotentiary delegations from the Russian SFSR, the Transcaucasian SFSR, the Ukrainian SSR, and the Byelorussian SSR approved the Treaty on the Creation of the USSR and the Declaration of the Creation of the USSR, forming the Union of Soviet Socialist Republics. These documents were confirmed by the 1st Congress of Soviets of the USSR and signed by heads of delegations.