Flag of the Soviet Union.

The Union of Soviet Socialist Republics (USSR) was a constitutionally socialist state that existed in Eurasia from 1922 to 1991. The name is a translation of the Russian: Союз Советских Социалистических Республик​, tr. Soyuz Sovetskikh Sotsialisticheskikh Respublik, abbreviated СССР, SSSR. The common short name is Soviet Union, from Советский Союз, Sovetskiy Soyuz. A soviet is a council, the theoretical basis for the socialist society of the USSR.

From 1945 until dissolution in 1991—a period known as the Cold War—the Soviet Union and the United States of America were the two world superpowers that dominated the global agenda of economic policy, foreign affairs, military operations, cultural exchange, scientific advancements including the pioneering of space exploration, and sports (including the Olympic Games and various world championships).

Initially established as a union of four Soviet Socialist Republics, the USSR grew to contain 15 constituent or "union republics" by 1956: Armenian SSR, Azerbaijan SSR, Byelorussian SSR, Estonian SSR, Georgian SSR, Kazakh SSR, Kirghiz SSR, Latvian SSR, Lithuanian SSR, Moldavian SSR, Russian SFSR, Tajik SSR, Turkmen SSR, Ukrainian SSR and Uzbek SSR. (From annexation of the Estonian SSR on August 6, 1940 up to the reorganization of the Karelo-Finnish SSR into the Karelian ASSR on July 16, 1956, the count of "union republics" was sixteen.)

The Russian Federation is the successor state to the USSR. Russia is the leading member of the Commonwealth of Independent States.

Alternate versions of the USSR have been discovered in the multiverse:

See also

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