How did the Truman Doctrine shape U.S. foreign policy after World War II?

The Truman Doctrine was intended to prevent Greece and Turkey from becoming communist countries. However, its broad language had implications beyond those two nations, suggesting that U.S. policy generally should be to aid people who resisted outside forces attempting to impose communist rule. This doctrine led to U.S. involvement in Korea and Vietnam, where U.S. forces fought against communist forces in those nations. The United States did have a plan for assisting the European economies, but it was the Marshall Plan, not the Truman Doctrine. While President Truman did establish a President's Committee on Civil Rights, it was not as a result of the Truman Doctrine. Finally, when inflation plagued the postwar U.S. economy, the federal government took measures to address inflation and other economic issues, rather than steering clear of them.