Identifying the Cold War Policy

After World War II, tensions between the United States and the Soviet Union began to escalate, leading to a period of geopolitical conflict known as the Cold War. In 1947, U.S. foreign policy shifted towards containment of communism, aiming to prevent its spread beyond where it already existed. This new approach characterized American strategy during the subsequent decades. One key event marking the beginning of this policy was the announcement made by President Harry S. Truman regarding the aid to Greece and Turkey. What was the name of this policy that aimed to contain the influence of the Soviet Union?