Soviet Union

Union of Soviet Socialist Republics (Russian, Soyuz Sovyetskikh Sotsialisticheskikh Respublik), former multinational federal state of European and Asian peoples, established as a result of the Russian Revolution of November 1917, on the territory of the former Russian Empire. The Union of Soviet Socialist Republics (USSR) was generally called the Soviet Union, but also, on occasion, Soviet Russia or Russia. It collapsed in 1991.