The Truman Doctrine and its Consequences – In early 1947 Britain announced that it could no longer afford to resist the spread of communist influence in Greece and Turkey. Therefore Truman announced that the US would provide aid to anti- communist forces in these areas. This policy of containment is known as the Truman Doctrine. – The Truman Doctrine makes it clear that the US would provide economic and military aid in order to ‘contain’ the spread of communism. – The Truman Doctrine was also formed in a reaction to the ‘domino theory’ which stated that if one region came under communist influence than the surrounding nations would follow in a domino effect. – The Truman Doctrine was evidence of a move from a policy of isolationism to one of containment.