Explain the development and meaning of the Truman doctrine, the Marshall Plan, and NATO.

By the end of 1945, the Grand Alliance of World War II was in shambles, and with it any realistic hope of a postwar world constructed according to the Atlantic Charter ideals Roosevelt and others had supported. A new American policy was emerging. Rather than creating a unified and "open" world, American worked on "containing" the threat of Soviet expansion. The Truman Doctrine, the Marshall Plan, and NATO were effective measures taken to contain Soviet expansion …

…NATO fused European nations that had been fighting against each other for centuries into a strong and enduring alliance against the Soviet Union. Three actions taken by the United States greatly helped contain the Soviet Union's influence. The Truman Doctrine openly declared the United State's goal of containing communism. The Marshall Plan helped Europe from falling to communism and NATO created a strong alliance against communism. Thus communism was effectively contained during the cold war.