The central idea is that the United States is willing to assist communist countries.
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.
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The central idea, in this case, is that the United States is willing to assist communist countries. To persuade his audience and illustrate facts, the author employs pathos and logos.
Thus, the central idea is that the United States is willing to assist communist countries.
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