Final answer:
President Truman's policy to support nations resisting subjugation, particularly involving events in Greece and Turkey in 1947, is known as the Truman Doctrine, which played a key role in U.S. containment strategy during the Cold War era.
Step-by-step explanation:
As a result of events in Greece and Turkey in 1947, President Truman argued that "it must be the policy of the United States to support free peoples who are resisting subjugation by armed minorities or by outside pressures." The policy that President Truman was advocating for became known as the Truman Doctrine. This doctrine was instrumental in the United States' foreign policy during the Cold War era as it committed the U.S. to a policy of containment, aiming to prevent the spread of communism. The Congress supported Truman's plea and dedicated $400 million in aid to Greece and Turkey. Consequently, the Greek government was able to overcome the communist rebels with the help of U.S. aid and military equipment, and Turkey managed to maintain control over the strategically important Dardanelles, resisting communist pressure.