The Russian Soviet Federative Socialist Republic, Russian SFSR or RSFSR (Russian: Российская Советская Федеративная Социалистическая Республика, tr. Rossíyskaya Sovétskaya Federatívnaya Socialistíčeskaya Respúblika, IPA: [rɐˈsʲijskəjə sɐˈvʲetskəjə fʲɪdʲɪrɐˈtʲivnəjə sətsɨəlʲɪˈsʲtʲitɕɪskəjə rʲɪˈspublʲɪkə]), previously known as the Russian Soviet Republic and the Russian Socialist Federative Soviet Republic as well as being unofficially known as Soviet Russia, the Russian Federation or simply Russia, was an independent federal socialist state from 1917 to 1922, and afterwards the largest and most populous of the Soviet socialist republics of the Soviet Union (USSR) from 1922 to 1991, until becoming a sovereign part of the Soviet Union with priority of Russian laws over Union-level legislat