Why did the US decide to adopt the Truman Doctrine?
The government in USA was deeply unhappy with the Communism’s expansion to eastern Europe, which seemed to go further and further, threatening the power of capitalism. Traditionally America’s policy was based on isolationism, but the threat of Communism expansion made the Americans realise that this was no longer possible if it wanted to have a world, where the dominant ideology would be based on capitalism, and not its opposite, communism.
At Yalta it was agreed that each liberated country would have an emergency government set up and then free elections would be held. However, Stalin misunderstood - or as many historians suspect ignored - this and he gave leading positions to Communists in governments in eastern Europe, then held rigged elections and soon Romania, Bulgaria, Hungary, Czechoslovakia and Poland fell under the control of the USSR due to these steps that strengthened the Communist Soviets’ control in the government of these countries . This angered very much the Americans, who afraid of a possible continuity of this expansion towards Western Europe (or even worse - a map of the world dominated by the communist ideology) , decided to reject isolationism and try to stop Communism spread out.

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The author does well to set out the key reasons why the USA adopted the Truman Doctrine, making this a relevant answer with sound explanation. However, the evaluation needs to be developed as the nature of the Doctrine is not addressed; this would have helped the reader understand motivations. The conclusion needs expansion. 4 stars.