Abstract
During the twenty year period of 1945 through 1965 perhaps the most dramatic example of presumed presidential opinion leadership is President Truman’s speech proclaiming what came to be called the Truman Doctrine. Delivered to Congress and broadcast across the nation on radio, the speech has been widely acknowledged as establishing the temper of postwar U.S. foreign policy. Historians whether sympathetic or critical of the Truman administration agree that this speech more than any other single event marks the beginning of the Cold War between the United States and the Soviet Union. Moreover, its implications for the future did not require hindsight available only to historians. Immediately, contemporaries in Washington and abroad grasped that President Truman was advocating a fundamental change in the U.S. responsibility and posture toward the world.

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