Why Did Communism 'Need' to be Contained? (Cambridge (CIE) IGCSE History): Revision Note

Exam code: 0470 & 0977

Zoe Wade

Written by: Zoe Wade

Reviewed by: Bridgette Barrett

Updated on

Why Did Communism 'Need' to be Contained? - Timeline & Summary

Vertical timeline showing major events from 1950 to 1975:

1950–1953: Korean War

June 1950: North Korea invades South Korea.

July 1950: US and UN troops support South Korea.

Oct 1950: UN pushes North back; China joins.

1951–1953: Stalemate around 38th Parallel.

July 1953: Armistice signed; Korea still divided.

1954–1955: Vietnam Split

March 1954: French defeated; Geneva Accords split Vietnam.

Oct 1955: Diem becomes president of South Vietnam after rigged election; US sends support.

1957–1960: Rise of Vietcong

1957: Viet Minh begins guerrilla warfare.

1960: NLF (Vietcong) formed in South.

1962: Cuban Missile Crisis

Oct 14: U-2 spy plane finds Soviet missiles.

Oct 16–28: ‘Thirteen Days’ of tension.

Oct 22: US announces blockade.

Oct 24: Soviet ships turn back.

Oct 28: Khrushchev agrees to remove missiles; secret deal over US missiles in Turkey.

1963–1965: Vietnam escalates

Nov 1963: Diem assassinated.

Aug 1964: Gulf of Tonkin incident sparks US escalation.

1965: Operation Rolling Thunder begins.

1968: Tet Offensive & My Lai Massacre

Jan 1968: Tet Offensive — major Vietcong attacks.

March 1968: My Lai Massacre (500 civilians killed); public outcry in US.

1969–1975: US withdrawal from Vietnam

1969: Ho Chi Minh dies; Nixon begins Vietnamisation but bombs Cambodia.

1973: Paris Peace Accords signed.

1975: Final US troops leave Vietnam by March.

US hysteria around Communism began after Russia experienced a Communist uprising in 1917. The Red Scare of the 1920s was the belief that immigration had meant that Communists were everywhere in the USA. The press sensationalised that Communism threatened the US way of life. Where the USA prided itself on the American Dream, the USSR believed wealth should be distributed. 

This attitude worsened after the Second World War due to a period called McCarthyism. Joseph McCarthy was an ex-soldier and Republican representative in the US Senate. McCarthy used rumours and threats to become a powerful anti-Communist figure. In the early 1950s, he held hearings in an attempt to expose Communists at various levels of the US government. While the government turned against McCarthy in 1954, his accusations heightened the public’s fear of Communism. Voters applied pressure on the government to do more to protect global capitalism and human rights.

After 1945, the USA changed their approach to foreign policy. Before the Second World War, the USA had followed a policy of isolationism. They refused to get involved in other countries' affairs. The Long Telegram (1946) informed Truman that the USA should contain communism to the USSR. As a result, the Truman Doctrine (1947) officially replaced isolationism with containment

International events after the Second World War motivated the USA to try and contain communism. The USSR had created satellite states in Eastern Europe between 1945 and 1948. China turned Communist in 1949 under Mao Zedong. Both events scared the USA. To them, it looked like China and the USSR were making the whole of Asia Communist. The USA formulated the idea of the Domino Theory. If one country fell to Communism, surrounding countries would fall like a row of dominoes. The USA believed that, if Asia fell to Communism, Europe and the USA would fall too.

The USA believed that it was their responsibility to stop the Communist takeover of the world. The USA applied containment in Korea (1950-1953), Cuba (1959-1962) and Vietnam (1955-1973). In each of these attempts, the USA failed to overthrow Communism. By 1973, containment ruined the USA’s international reputation.

Causes and Consequences of Containment

A diagram showing the causes and consequences of the policy of containment. In the centre is a red label: “Containment of Communism”, connected to two sides.

On the left (Causes):
Four green boxes list causes:

The Communist Revolution in Russia (1917) and the Red Scare

McCarthyism (1950s)

Domino Theory

The Satellite States of Eastern Europe
Blue arrows point toward the centre label. A fraying rope also links the causes to the centre, symbolising tension and strain between American fears and communist expansion.

On the right (Consequences):
Three blue boxes list consequences:

Wars in Korea and Vietnam

The Cuban Missile Crisis

The USA’s reputation as a protector of freedom is damaged
A diagram showing the causes and consequences of the US policy of containment

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Zoe Wade

Author: Zoe Wade

Expertise: History Content Creator

Zoe has worked in education for 10 years as a teaching assistant and a teacher. This has given her an in-depth perspective on how to support all learners to achieve to the best of their ability. She has been the Lead of Key Stage 4 History, showing her expertise in the Edexcel GCSE syllabus and how best to revise. Ever since she was a child, Zoe has been passionate about history. She believes now, more than ever, the study of history is vital to explaining the ever-changing world around us. Zoe’s focus is to create accessible content that breaks down key historical concepts and themes to achieve GCSE success.

Bridgette Barrett

Reviewer: Bridgette Barrett

Expertise: Geography, History, Religious Studies & Environmental Studies Subject Lead

After graduating with a degree in Geography, Bridgette completed a PGCE over 30 years ago. She later gained an MA Learning, Technology and Education from the University of Nottingham focussing on online learning. At a time when the study of geography has never been more important, Bridgette is passionate about creating content which supports students in achieving their potential in geography and builds their confidence.