How did the truman doctrine oppose communism and address the idea of interventionism in foreign nations by the u. s.?

With the Truman Doctrine, President Harry S. Truman established that the United States would provide political, military and economic assistance to all democratic nations under threat from external or internal authoritarian forces. ... Truman asked Congress to support the Greek Government against the Communists.

your answer would be a) no nation can be economically self-sufficient.

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