The Truman Doctrine announced in 1947 marked a major shift in United States foreign policy, committing America to support democratic nations threatened by authoritarian forces.

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•  The Truman Doctrine was announced by United States President Harry S. Truman on March 12, 1947, during a speech to a joint session of the United States Congress.
•  The policy declared that the United States would provide political, military and economic assistance to democratic countries facing threats from authoritarian regimes or armed groups.
•  The doctrine emerged after Britain announced it would stop providing financial and military aid to Greece during its civil war against communist forces.
•  President Truman asked Congress to approve four hundred million dollars in assistance for Greece and Turkey to prevent the expansion of communist influence in the region.
•  The United States feared that a communist victory in Greece could destabilize Turkey and weaken political stability across the strategically important Middle East.
•  The doctrine was also influenced by growing tensions between the United States and the Soviet Union during the early years of the Cold War.
•  Through this policy, the United States adopted a strategy of containing communism and preventing its spread to other countries.
•  The Truman Doctrine marked a major shift in American foreign policy from isolationism to active global involvement in defending democratic governments.