СРСР, or the Союз Советских Социалистических Республик (USSR), was a federal socialist state that existed from 1922 to 1991. It was composed of multiple republics, with Россия (Russia) being the largest and most influential. The USSR was established after the Русская революция and was characterized by a one-party system led by the Коммунистическая партия. The USSR played a significant role in global events, particularly during the Холодная война against the Соединенные Штаты. It was known for its centralized economy, state ownership of resources, and extensive social programs. The dissolution of the USSR in 1991 led to the independence of its republics and significant political and economic changes in the region.