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The Soviet Union or USSR (1922–1991) was a socialist state in Eurasia. After the 1924 death of founding leader Lenin (who led the October Revolution in 1917), Stalin established a planned economy and suppressed political opposition. After World War II, the Soviet Union emerged as one of the world's two superpowers, opposing the USA in the Cold War. 1980s leader Gorbachev attempted reform with perestroika and glasnost but the country collapsed in 1991.