U.S.S.R.

The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen national republics; in practice, both its government and its economy were highly centralized until its final years. It was a one-party state governed by the Communist Party of the Soviet Union, with the city of Moscow serving as its capital as well as that of its largest and most populous republic: the Russian SFSR. Other major cities included 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, covering over and spanning eleven time zones.

The country's roots lay in the October Revolution of 1917, when the Bolsheviks, under the leadership of Vladimir Lenin, overthrew the Russian Provisional Government that had earlier replaced the House of Romanov of the Russian Empire. The Bolshevik coup led to the establishment of the Russian Soviet Republic, the world's first constitutionally guaranteed socialist state. Persisting internal tensions escalated into the Russian Civil War. By 1922 the Bolsheviks under Vladimir Lenin had emerged victorious, forming the Soviet Union. Following Lenin's death in 1924, Joseph Stalin came to power. Stalin inaugurated a period of rapid industrialization and forced collectivization that led to significant economic growth, but also contributed to a famine in 1930–1933 that killed millions. The labour camp system of the Gulag was also expanded in this period. Stalin conducted the Great Purge to remove his actual and perceived opponents. After the outbreak of World War II, Germany invaded the Soviet Union. The combined Soviet civilian and military casualty count—estimated to be around 27 million people—accounted for the majority of losses of Allied forces. In the aftermath of World War II, the territory taken by the Red Army formed various Soviet satellite states.

The beginning of the Cold War saw the Eastern Bloc of the Soviet Union confront the Western Bloc of the United States, with the latter grouping becoming largely united in 1949 under NATO and the former grouping becoming largely united in 1955 under the Warsaw Pact. Following Stalin's death in 1953, a period known as de-Stalinization occurred under the leadership of Nikita Khrushchev. The Soviets took an early lead in the Space Race with the first artificial satellite, the first human spaceflight, and the first probe to land on another planet (Venus). In the 1970s, there was a brief ''détente'' in the Soviet Union's relationship with the United States, but tensions resumed following the Soviet invasion of Afghanistan in 1979. In the mid-1980s, the last Soviet leader, Mikhail Gorbachev, sought to reform the country through his policies of ''glasnost'' and ''perestroika''. In 1989, during the closing stages of the Cold War, various countries of the Warsaw Pact overthrew their Marxist–Leninist regimes, which was accompanied by the outbreak of strong nationalist and separatist movements across the entire Soviet Union. In 1991, Gorbachev initiated a national referendum—boycotted by the Soviet republics of Lithuania, Latvia, Estonia, Armenia, Georgia, and Moldova—that resulted in the majority of participating citizens voting in favour of preserving the country as a renewed federation. In August 1991, hardline members of the Communist Party staged a coup d'état against Gorbachev; the attempt failed, with Boris Yeltsin playing a high-profile role in facing down the unrest, and the Communist Party was subsequently banned. All of the republics emerged from the dissolution of the Soviet Union as fully independent post-Soviet states.

The Soviet Union produced many significant social and technological achievements and innovations. It had the world's second-largest economy, and the Soviet Armed Forces comprised the largest standing military in the world. An NPT-designated state, it possessed the largest arsenal of nuclear weapons in the world. It was a founding member of the United Nations as well as one of the five permanent members of the United Nations Security Council. Before the dissolution, the country had maintained its status as one of the world's two superpowers through its hegemony in Eastern Europe, military and economic strengths, aid to developing countries, and scientific research.

Etymology

The word ''soviet'' is derived from the Russian word (russian: link=no, совет), meaning 'council', 'assembly', 'advice', (); pl, rada; be, савет/рада; uz, совет; kk, совет / кеңес (); ka, საბჭოთა (); az, совет, italic=no; lt, taryba; ro, soviet (Moldovan Cyrillic: ); lv, padome; ky, совет; tg, шӯравӣ / совет (); hy, խորհուրդ / սովետ (); tk, совет, italic=no; et, nõukogu. ultimately deriving from the proto-Slavic verbal stem of ('to inform'), related to Slavic ('news'), English ''wise'', the root in ''ad-vis-or'' (which came to English through French), or the Dutch ('to know'; compare meaning 'science'). The word ''sovietnik'' means 'councillor'. Some organizations in Russian history were called ''council'' (russian: link=no, совет). In the Russian Empire, the State Council which functioned from 1810 to 1917 was referred to as a Council of Ministers.

The Soviets as workers' councils first appeared during the Russian revolution of 1905. Although they were quickly suppressed by the imperial government, the Soviets re-emerged across the country after the February revolution of 1917, and shared power with the Russian Provisional Government. The Bolsheviks, led by Vladimir Lenin, used the slogan "all power to the Soviets" to oppose the Provisional Government, and seized power from it with the October coup of 1917. In January 1918, at the third All-Russian Congress of Soviets, Lenin proclaimed the formation of the Russian Socialist Federal Soviet Republic (RSFSR).

During the Georgian Affair of 1922, Lenin called for the RSFSR and other national Soviet republics to form a greater union which he initially named as the Union of Soviet Republics of Europe and Asia ( rus, links=no, Союз Советских Республик Европы и Азии, Soyuz Sovetskikh Respublik Evropy i Azii). Joseph Stalin initially resisted Lenin's proposal but ultimately accepted it, although with Lenin's agreement changed the name to the Union of Soviet Socialist Republics (USSR), although all the republics began as ''socialist soviet'' and did not change to the other order until 1936. In addition, in the national languages of several republics, the word ''council'' or ''conciliar'' in the respective language was only quite late changed to an adaptation of the Russian ''soviet'' and never in others, e.g.