Marshall and Truman proposed economic aid to European countries after the second world war. They advocated that the Soviet union's influence increased in European countries and communism will spread.
President Truman proposed the request to Congress to provide economic assistance to European countries, especially Greece and Turkey.
Truman promised to provide aid to any country that will fight against communism. Because they believe that countries with strong economic power would not be tempted by communist ideas.
Therefore Marshall and Truman convinced the Americans and Congress to aid Europe.
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