The national policy aimed at containing the spread of communism was known as the "Truman Doctrine." Announced by President Harry S. Truman in 1947, it was primarily focused on providing political, military, and economic assistance to nations resisting communist influence. The doctrine was a critical component of U.S. foreign policy during the Cold War, marking a shift towards active intervention in global affairs to prevent the expansion of communism, particularly in Europe and Asia. This policy laid the groundwork for future U.S. actions in conflicts like the Korean War and the Vietnam War, solidifying America’s role as a global superpower committed to defending democracy.