Russian Soviet Federative Socialist Republic
The Russian Soviet Federative Socialist Republic (Russian SFSR or RSFSR; , also 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 socialist state from 1917 to 1922. Afterwards it was the largest and most populous of the Soviet socialist republics of the Soviet Union (USSR) from 1922 to 1991. When the Soviet Union broke up, the Russian SFSR became known as the country of Russia.