The Truman Doctrine Was Announced
On this day · 12 March 1947
In a single speech to Congress, an American president redrew the map of the postwar world and lit the fuse of the Cold War.
On March 12, 1947, President Harry S. Truman stood before a joint session of Congress and made a promise that would shape decades of foreign policy. He asked lawmakers for $400 million in aid for Greece and Turkey, two nations he warned were vulnerable to communist pressure after Britain announced it could no longer prop them up.
Truman framed the request in sweeping terms. The United States, he argued, must support “free peoples” resisting “totalitarian regimes,” because the spread of authoritarian rule abroad threatened peace and American security at home.
It was less a budget line than a worldview, and historians often mark it as the official opening of the Cold War.
The policy quickly became known as the Truman Doctrine. It committed Washington to a long-term strategy of containment, justifying military and economic intervention across the globe and setting the stage for the Marshall Plan later that same year.
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