Indeed, both nations established repressive right-wing regimes in the years following the Truman Doctrine. Yet, the Truman Doctrine successfully convinced many that the United States was locked in a life-or-death struggle with the Soviet Union, and it set the guidelines for over 40 years of U.S.-Soviet relations.

What happened as a result of the Truman Doctrine?

More generally, the Truman Doctrine implied American support for other nations threatened by Soviet communism. This became the foundation of American foreign policy, and led to the 1949 formation of NATO, a military alliance that is still in effect.

Why was the Truman Doctrine successful?

The Truman Doctrine effectively reoriented U.S. foreign policy, away from its usual stance of withdrawal from regional conflicts not directly involving the United States, to one of possible intervention in far away conflicts.