The Union of Soviet Socialist Republics (abbreviate USSR, Russian: Союз Советских Социалистических Республик, СССР (help·info); tr.: Soyuz Sovetskikh Sotsialisticheskikh Respublik, SSSR), also called the Soviet Union (Russian: Советский Союз; tr.: Sovetsky Soyuz), was a constitutionally socialist state that existed in Eurasia from 1922 to 1991.