Containment Doctrine: The Containment Doctrine was a U.S. foreign policy strategy during the Cold War that aimed to prevent the spread of communism by containing it within its existing boundaries.
Truman Doctrine: The Truman Doctrine was a policy announced by President Harry S. Truman that provided economic and military assistance to Greece and Turkey in order to prevent them from falling into communist control.
Marshall Plan: The Marshall Plan was an American initiative launched after World War II that provided financial aid to help rebuild Western European economies, with the goal of preventing those countries from turning towards communism.