Answer :
Final answer:
The Truman Doctrine introduced in 1947 aimed to contain communism by supporting nations resisting Communist subjugation.
Explanation:
Truman Doctrine was a policy initiated by President Truman in March 1947, aiming to contain communism by providing aid to countries threatened by Communist forces. This doctrine marked a shift in U.S. foreign policy towards preventing the spread of Communism globally, especially seen in the support given to Greece and Turkey to resist Communist pressures.
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This action against communism by president Truman was known as the Truman doctrine and introduced the containment policy.