Answer :
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The most suitable options are: to contain Soviet expansion, and to rescue Greece and Turkey from communist takeovers.
The Truman Doctrine was a foreign policy carried out during the Cold War. Its main purpose was to contain Soviet geopolitical expansion and it was further developed when the American Congress decided to support Greece and Turkey's armies since both nations were threatened by Communism.
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To contain Soviet expansion
Further Explanation:
The Truman Doctrine was American Foreign Policy and that was made in order to counter geographical expansion of Soviet Union during the period of cold war. Truman Doctrine was announced by the President of the United States, Harry S. Truman. This doctrine was made to support the nations which were threatened or felt insecure by the Soviet communism and Truman Doctrine was known to be the foundation of the Foreign policy of the United States under Harry S. Truman. This doctrine was also the reason behind formation of NATO.
The Truman Doctrine shifted the Foreign Policy of the United States from Europe to Soviet Union as President Truman did not wanted Soviet Union to expand. Truman Doctrine was made in year 1947 but it was extended in year 1948 and the reason behind its extension was when Truman promised his support to Greece and Turkey. Military force of the United States was not involved in direct war between Turkey and Greece against Soviet union but United States provided financial support to these countries to stop Soviet expansion.
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Answer Details:
Grade: High School
Chapter: Truman Doctrine
Subject: History
Keywords: United States, Harry S. Truman, Truman Doctrine, Soviet Union, Turkey, Greece, NATO, Foreign Policy, Military, Economic aid, President.