The Russian Soviet Federative Socialist Republic (transliterated as Rossiyskaya Sovetskaya Federativnaya Sotsialisticheskaya Respublika [RSFSR]), also called the Russian Soviet Federated Socialist Republic, the Russian SFSR and the RSFSR for short, was the largest and most populous of the fifteen Soviet republics of the Soviet Union. It became the Russian Federation on the collapse of the Soviet Union. It was by far the largest sub-national entity in the world by area and 2nd in population afte… (More on Rsfsr)