USSR
The Soviet Union, officially the Union of Soviet Socialist Republics (USSR), was a transcontinental country that spanned much of Eurasia from 1922 until its dissolution in 1991. It was the world's third-most populous country, the largest by area, and bordered twelve countries. A diverse multinational state, it was organized as a federal union of national republics, with the largest and most populous being the Russian SFSR. In practice, its government and economy were highly centralized. As a one-party state governed by the Communist Party, it was the flagship communist state. Its capital and largest city was Moscow.
The Soviet Union's roots lay in the October Revolution of 1917. The new government, led by Vladimir Lenin, established the Russian SFSR, the world's first constitutionally communist state. Following the Bolshevik victory in the Russian Civil War, the Russian SFSR and its subordinate republics were merged into the Soviet Union in 1922. Following Lenin's death in 1924, Joseph Stalin came to power, initiating rapid industrialization and forced collectivization that led to significant growth but contributed to a devastating famine in the 1930s that killed millions. The Soviet forced labour camp system, known as the Gulag, was expanded. During the late 1930s, Stalin's government conducted the Great Purge to eliminate opposition, resulting in deportations, executions, and the Moscow trials. Failing to build an anti-Nazi coalition in Europe, the Soviet Union signed a non-aggression pact with Nazi Germany in 1939. However, in 1941, Germany invaded the Soviet Union in the largest land invasion in history, opening the Eastern Front of World War II. The Soviets played a decisive role in defeating the Axis powers as part of the Allies, while liberating much of Central and Eastern Europe. With around 27 million casualties, it suffered the most deaths of any country in World War II. In the war's aftermath, the Soviet Union consolidated the territories occupied by the Red Army into satellite states and undertook rapid economic development, cementing its status as a superpower.
Geopolitical tensions with the United States led to the Cold War. The US-led Western Bloc coalesced into the NATO military alliance in 1949, prompting the Eastern Bloc to form the Warsaw Pact in 1955. With little direct combat, the blocs engaged in ideological and proxy wars. In 1953, following Stalin's death, Nikita Khrushchev initiated a campaign of de-Stalinization, which led to ideological tensions with communist China, under Mao Zedong, and culminated in an acrimonious split. The Soviet military suppressed uprisings in East Germany, Hungary and Czechoslovakia, while the resolution of the Cuban Missile Crisis narrowly averted a global conflict. Under Leonid Brezhnev, prosperity shifted toward stagnation, although relations with the US eased. In 1985, Mikhail Gorbachev sought reform through his policies of glasnost and perestroika. In 1989, most Warsaw Pact countries overthrew their Soviet-backed regimes, effectively ending the Eastern Bloc. Nationalist movements across the Soviet republics declared sovereignty, and in 1991, a successful referendum to establish a renewed federation was followed by a failed coup by hardliners. This prompted Russia, Ukraine, and Belarus to secede. On 26 December, Gorbachev officially recognized the dissolution of the Soviet Union. Boris Yeltsin, president of the Russian SFSR, oversaw its reconstitution into the Russian Federation, the Soviet Union's successor state. All fifteen republics became independent states; all except the Baltic states joined the Commonwealth of Independent States. The post-Soviet states experienced a humanitarian disaster.
The Soviet Union was one of the world's two superpowers, with hegemony in Eastern Europe, global diplomacy, ideological influence (particularly in the Global South), military might, economic strength, and scientific and technological accomplishments. Its space program made significant achievements in the Space Race. It had the world's second-largest economy and the largest standing military. As a nuclear state, it wielded the largest arsenal of nuclear weapons in the world. As an Allied nation, it was a founding member of the United Nations and one of five permanent members of its Security Council.
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