The Cold War: causes, key events and how it ended
Understand the rivalry between the US and the Soviet Union from 1945 to 1991, with key events such as the Berlin Wall and the Cuban Missile Crisis.
GCSEA-LevelHigh SchoolAPCurriculum fit: KS3 and GCSE History (the Cold War in the National Curriculum; exam boards cover it in most specifications); A-Level; US high school history and AP.
On this page
What is it?
The Cold War was a long period of tension between the United States and its allies, and the Soviet Union and its allies, from the end of the Second World War until 1991. It was a struggle between two systems: capitalism and democracy against communism.
The superpowers never fought each other directly. They competed through alliances, an arms race, a space race and by supporting opposing sides in wars elsewhere.
Key formulas and ideas
- 1947: the Truman Doctrine and the Marshall Plan. 1948 to 1949: the Berlin Blockade and airlift.
- 1949: NATO formed. 1950 to 1953: Korean War. 1955: Warsaw Pact formed.
- 1961: Berlin Wall built. October 1962: Cuban Missile Crisis.
- 9 November 1989: Berlin Wall opened. December 1991: the Soviet Union dissolved.
Worked examples
Example 1: Why 'cold'?
Question: Explain why it was called a 'cold' war.
- The US and USSR did not fight each other directly.
- The rivalry was fought through threats, spying, propaganda and proxy wars.
Answer: There was no direct fighting between the superpowers
Example 2: The Cuban Missile Crisis
Question: Why was October 1962 so dangerous?
- The Soviet Union placed nuclear missiles in Cuba, close to the US.
- The US blockaded Cuba and demanded their removal.
- Both sides came close to nuclear war before an agreement was reached.
Answer: It brought the superpowers close to nuclear war
Example 3: End of the Cold War
Question: Give two reasons the Cold War ended.
- The Soviet economy struggled and its leader Gorbachev introduced reforms.
- Eastern European countries moved away from communism in 1989.
Answer: Soviet economic problems and reforms, and the 1989 revolutions
Common mistakes
- Saying the US and USSR fought a direct war.
- Mixing up NATO and the Warsaw Pact.
- Treating the Cold War as a single event instead of a period with phases.
- Confusing the dates of the Berlin Wall's building and its fall.
Practice questions
Frequently asked questions
Why was it called 'cold'?
Because the US and the USSR did not fight a direct, open war against each other.
What was a proxy war?
A war in which the superpowers backed opposing sides without fighting each other directly, such as the Korean War.
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Reviewed by StudyMorrow editorial review on 5 Nov 2026.