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 and communism.
On March 12, 1947, President Truman appeared before Congress and gave the speech which became known as the Truman…