Containment was the American policy of trying to stop the spread of Soviet influence without direct war. This lesson sets out the documented actions and consequences of that policy and shows how to write about them with attribution.
It is part of Core option B study pathways. It follows Cold War origins and leads into Soviet influence in Eastern Europe.
What actions were taken?
- Long Telegram (February 1946): George Kennan’s assessment of Soviet policy, widely read in the American government. In 1947 he published an article in Foreign Affairs setting out the idea of containment.
- Truman Doctrine (March 1947): President Truman asked Congress for aid, about 400 million dollars, for Greece and Turkey, and described a wider support for free peoples resisting pressure.
- Marshall Plan (announced June 1947): economic aid for European recovery. About 13 billion dollars was provided over the following years, by commonly cited figures, so check the figure your course gives.
- Berlin airlift (1948 to 1949): Western supply of West Berlin by air during the Soviet blockade.
- NATO (April 1949): a military alliance of North American and Western European states.
- Korean War (from June 1950): United Nations forces, led by the United States, supported South Korea after the North’s invasion. An armistice was signed in July 1953.
What were the consequences?
- Division of Germany: two German states were founded in 1949, the Federal Republic in May and the German Democratic Republic in October.
- Opposing alliances: NATO in 1949 and the Warsaw Pact, formed in 1955.
- Soviet counter-measures: the Cominform (1947) and Comecon (1949).
- Military build-up and wider conflict: the Korean War showed the Cold War could include direct fighting by allies and, in this case, by the United States.
Worked example: describe, attribute, qualify
Question: How far was the Marshall Plan an act of containment?
“The Marshall Plan offered economic aid to European states from 1947. American officials described it as supporting recovery, and Western European states accepted it. Some historians argue that it was also designed to limit Soviet influence by strengthening Western European economies, and the Soviet response, which rejected participation and pressed Eastern European states to do the same, is documented. The evidence supports the view that the plan was both a recovery programme and part of a wider strategy, though the weight of each purpose is a matter of interpretation.”
The paragraph states the facts, separates what officials said from what historians argue, and ends with a qualified conclusion.
What mistake do students make?
Mistaken sentence: “Containment was successful because communism was stopped.”
It assumes the aim and the result without evidence and uses a present-day judgement. Replace it with documented outcomes and specify the measure: “South Korea remained outside Communist control after the war, though the peninsula remained divided.”
Check yourself
1. Name two actions of containment before 1950.
Show answer
Any two of: Truman Doctrine (1947), Marshall Plan (announced 1947), Berlin airlift (1948 to 1949), NATO (1949).
2. Why is “Kennan’s article proves America aimed to dominate Europe” unsafe?
Show answer
It claims an intention the article does not establish. The article set out an idea of containment. What American officials aimed for must be argued from wider evidence and attributed.
3. Give one consequence and one cause it links to.
Show answer
For example: the creation of the Warsaw Pact in 1955 followed the formation of NATO in 1949, as a documented response by the Soviet-led states.
Where this leads next
Compare accounts with the source comparison lesson, then study Soviet influence in Eastern Europe. The practice set includes a containment question. If you would like feedback on your own paragraphs, see our online one-to-one History tuition.