The Truman Doctrine was a foreign policy announced by President Harry Truman in 1947, which aimed to contain the spread of communism around the world. The reasoning behind the Truman Doctrine was the growing concern about the spread of Soviet influence and the communist ideology in Europe and Asia after the end of World War II. Truman believed that the Soviet Union was attempting to expand its sphere of influence and spread its ideology through a policy of subversion and aggression. The Truman Doctrine was intended to counter this perceived threat by providing military and economic assistance to countries that were at risk of falling under Soviet control or influence. Additionally, it was meant to promote a strong stance against communism to support the free nations that were resisting totalitarian forces.