The Soviet Union (USSR) existed from 1922 to 1991. It emerged after the 1917 Russian Revolution and became the largest state in the world, representing socialist ideology.
Formed by fifteen Soviet republics, the USSR dissolved in 1991, bringing an end to the Cold War. The collapse was accelerated by a severe economic crisis that began in the 1970s and turned into a political crisis.
Russian Revolution of 1917
The October Revolution, led by Vladimir Lenin, overthrew the Provisional Government of Alexander Kerensky, which had taken power after the February Revolution that ended the Romanov dynasty.
The Bolsheviks seized Petrograd, installed a socialist regime and started a civil war against the anti‑communist White Army, supported by foreign powers. The Red Army, commanded by Leon Trotsky, eventually defeated the opposition, allowing the creation of the USSR in 1922.
The rise of Stalin
After Lenin’s death in 1924 a power struggle erupted. Stalin outmaneuvered rivals such as Trotsky, Bukharin, Zinoviev and Kamenev and became the undisputed leader.
Stalin’s rule (1924‑1953) is known as Stalinism – a totalitarian regime marked by a cult of personality, massive political repression, forced collectivisation and rapid industrialisation through the five‑year plans.
Stalinism
Collectivisation turned private farms into state property, causing widespread famine, most notably the Holodomor in Ukraine. Millions perished in forced labour camps (Gulags). At the same time, heavy industry expanded dramatically.
World War II
The USSR initially signed the Molotov‑Ribbentrop Pact with Nazi Germany (1939). After Germany invaded the Soviet Union in 1941, the country fought the Great Patriotic War, losing about 20 million people but ultimately defeating the Nazis.
Key battles included Moscow, Stalingrad, Kursk and Berlin. The Soviet Union also participated in the Soviet‑Japanese conflict at Khalkhin Gol (1939) and the Winter War with Finland (1939‑1940).
Cold War
After 1945 the USSR and the United States entered a geopolitical rivalry that lasted until 1991. The Soviet bloc expanded over Eastern Europe, and the USSR intervened in Hungary (1956), Czechoslovakia (1968) and built the Berlin Wall (1961).
After Stalin’s death
Stalin died in 1953; Nikita Khrushchev succeeded him and launched de‑Stalinisation, denouncing the cult of personality and releasing many political prisoners.
Stagnation and crisis (1970‑80‑ies)
Under Leonid Brezhnev the system stagnated: an ageing bureaucracy, low productivity and growing corruption weakened the economy. The costly Afghan war (1979‑1989) and the Chernobyl disaster (1986) deepened the crisis.
Gorbachev’s reforms
Mikhail Gorbachev (1985‑1991) introduced glasnost (openness) and perestroika (restructuring) to revive the economy and the political system. The reforms unleashed nationalist movements and a failed coup in August 1991.
Collapse of the USSR
Faced with mounting economic problems and growing demands for independence, the Soviet Union dissolved on 25 December 1991, giving rise to fifteen independent states.
Members of the USSR
- Russia
- Ukraine
- Belarus
- Estonia
- Latvia
- Lithuania
- Armenia
- Georgia
- Moldova
- Azerbaijan
- Kazakhstan
- Tajikistan
- Kyrgyzstan
- Turkmenistan
- Uzbekistan
Leaders of the USSR
- Vladimir Lenin (1917‑1924)
- Joseph Stalin (1924‑1953)
- Nikita Khrushchev (1953‑1964)
- Leonid Brezhnev (1964‑1982)
- Yuri Andropov (1982‑1984)
- Konstantin Chernenko (1984‑1985)
- Mikhail Gorbachev (1985‑1991)
