The Soviet Union, officially the Union of Soviet Socialist Republics (USSR), was a federal socialist state in Northern Eurasia that existed from 1922 to 1991. Nominally a union of multiple national Soviet republics, it was a one-party state prior to 1990 governed by the Communist Party, with Moscow as its capital in its largest republic, the Russian SFSR. Other major urban centers were Leningrad (Russian SFSR), Kiev (Ukrainian SSR), Minsk (Byelorussian SSR), Tashkent (Uzbek SSR), Alma-Ata (Kazakh SSR) and Novosibirsk (Russian SFSR). It was the largest country in the world by surface area, spanning over 10,000 kilometers (6,200 mi) east to west across 11 time zones and over 7,200 kilometers (4,500 mi) north to south. Its territory included much of Eastern Europe, parts of Northern Europe and Western Asia, and all of Central and North Asia. Its five biomes were tundra, taiga, steppes, desert, and mountains. Its diverse population was officially known as the Soviet people.
The Soviet Union had its roots in the October Revolution of 1917 when the Bolsheviks, headed by Vladimir Lenin, overthrew the Provisional Government that had earlier replaced the monarchy of the Russian Empire. They established the Russian Soviet Republic, beginning a civil war between the Bolshevik Red Army and many anti-Bolshevik forces across the former Empire, among whom the largest faction was the White Guard, which engaged in violent anti-communist repression against the Bolsheviks and their worker and peasant supporters known as the White Terror. The Red Army expanded and helped local Bolsheviks take power, establishing soviets, repressing their political opponents and rebellious peasants through Red Terror. By 1922, the Bolsheviks had emerged victorious, forming the Soviet Union with the unification of the Russian, Transcaucasian, Ukrainian and Byelorussian republics. The New Economic Policy (NEP), which was introduced by Lenin, led to a partial return of a free market and private property; this resulted in a period of economic recovery.
Following Lenin's death in 1924, Joseph Stalin came to power. Stalin suppressed all political opposition to his rule inside the Communist Party and inaugurated a command economy. As a result, the country underwent a period of rapid industrialization and forced collectivization, which led to significant economic growth, but also led to a man-made famine in 1932–1933 and expanded the Gulag labour camp system originally established in 1918. Stalin also fomented political paranoia and conducted the Great Purge to remove his actual and perceived opponents from the Party through mass arrests of military leaders, Communist Party members, and ordinary citizens alike, who were then sent to correctional labor camps or sentenced to death.
On 23 August 1939, after unsuccessful efforts to form an anti-fascist alliance with Western powers, the Soviets signed the non-aggression agreement with Nazi Germany. After the start of World War II, the formally neutral Soviets invaded and annexed territories of several Eastern European states, including eastern Poland and the Baltic states. In June 1941 the Germans invaded, opening the largest and bloodiest theater of war in history. Soviet war casualties accounted for the highest proportion of the conflict in the cost of acquiring the upper hand over Axis forces at intense battles such as Stalingrad. Soviet forces eventually captured Berlin and won World War II in Europe on 9 May 1945. The territory overtaken by the Red Army became satellite states of the Eastern Bloc. The Cold War emerged in 1947 as a result of a post-war Soviet dominance in Eastern Europe, where the Eastern Bloc confronted the Western Bloc that united in the North Atlantic Treaty Organization in 1949.
Following Stalin's death in 1953, a period known as de-Stalinization and the Khrushchev Thaw occurred under the leadership of Nikita Khrushchev. The country developed rapidly, as millions of peasants were moved into industrialized cities. The USSR took an early lead in the Space Race with the first ever satellite and the first human spaceflight. In the 1970s, there was a brief détente of relations with the United States, but tensions resumed when the Soviet Union deployed troops in Afghanistan in 1979. The war drained economic resources and was matched by an escalation of American military aid to Mujahideen fighters.
In the mid-1980s, the last Soviet leader, Mikhail Gorbachev, sought to further reform and liberalize the economy through his policies of glasnost and perestroika. The goal was to preserve the Communist Party while reversing economic stagnation. The Cold War ended during his tenure and in 1989, Warsaw Pact countries in Eastern Europe overthrew their respective Marxist-Leninist regimes. In particular, the indecisive action of the Eastern European rulers after the Pan-European Picnic caused the fall of the Iron Curtain, which shattered the formerly powerful communist unity. This led to the rise of strong nationalist and separatist movements inside the USSR as well. Central authorities initiated a referendum—boycotted by the Baltic republics, Armenia, Georgia, and Moldova—which resulted in the majority of participating citizens voting in favor of preserving the Union as a renewed federation. In August 1991, a coup d'état was attempted by Communist Party hardliners. It failed, with Russian President Boris Yeltsin playing a high-profile role in facing down the coup, resulting in the banning of the Communist Party. On 25 December 1991, Gorbachev resigned and the remaining twelve constituent republics emerged from the dissolution of the Soviet Union as independent post-Soviet states. The Russian Federation (formerly the Russian SFSR) assumed the Soviet Union's rights and obligations and is recognized as its continued legal personality.
The USSR produced many significant social and technological achievements and innovations of the 20th century, including the world's first ministry of health, first human-made satellite, the first humans in space and the first probe to land on another planet, Venus. The country had the world's second-largest economy and the largest standing military in the world. The USSR was recognized as one of the five nuclear weapons states. It was a founding permanent member of the United Nations Security Council as well as a member of the OSCE, the WFTU and the leading member of the Council for Mutual Economic Assistance and the Warsaw Pact. Before the dissolution, the country had maintained its status as one of the world's two superpowers for four decades after World War II through its hegemony in Eastern Europe, military strength, economic strength, aid to developing countries, and scientific research, especially in space technology and weaponry.

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