Union of Soviet Socialist Republics Formed (1922)

Traditionally considered the successor state of the Russian Empire, the USSR was established in 1922 and unified the Russian, Ukrainian, Belarusian, and Transcaucasian Soviet republics under one government. The first state to be based on Marxist socialism, the USSR became a world superpower that rivaled the US in domination of global affairs until its collapse and dissolution in 1991. In what year were diplomatic relations between the US and USSR first established?

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