On the surface, the Truman Doctrine was to offer military and economic aid to the fighters attempting to repel Soviet backed forces in Greece and Turkey. However, the Truman Doctrine also allowed the U.S. and its allies to practice what would be called the Containment Theory. The theory said that Communism had to be contained in countries already exposed to Communism so they would not spread. If they spread to one country, the surrounding countries would also pick up Communism, in a domino effect that would cause the entire world to be Communist. This is a partial cause of the Vietnam War, attempting to aid in economic and military means, the South Vietnamese, who were trying to keep Communism contained to the north.
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On the surface, the Truman Doctrine was to offer military and economic aid to the fighters attempting to repel Soviet backed forces in Greece and Turkey. However, the Truman Doctrine also allowed the U.S. and its allies to practice what would be called the Containment Theory. The theory said that Communism had to be contained in countries already exposed to Communism so they would not spread. If they spread to one country, the surrounding countries would also pick up Communism, in a domino effect that would cause the entire world to be Communist. This is a partial cause of the Vietnam War, attempting to aid in economic and military means, the South Vietnamese, who were trying to keep Communism contained to the north.
It was a commitment to help nations that were threatened by communism and Soviet expansion
To prevent the Soviet Union from using force to spread communism
Marshall Plan, Truman doctrine and I guess you could include the Eisenhower Doctrine as well.
The countries involved in the Truman Doctrine were the United States, Greece, and Turkey. In a speech to a joint session of Congress on March 12, 1947, President Truman asked for U.S. assistance for Greece and Turkey to forestall communist domination of the two nations.
Communism ;)
fight the spread of communism aid nations that were in danger of becoming communist
George F. Kennan, toward the Truman doctrine