The document discusses several key US foreign policies and strategies during the Cold War period: 1) The policy of containment aimed to prevent the spread of Soviet communism by providing military, economic, or technical support to non-communist countries and stopping further communist expansion. 2) The Truman Doctrine of 1947 pledged US support for Greece and Turkey through economic and military aid to prevent them from falling into the Soviet sphere. 3) The Marshall Plan provided economic assistance to help rebuild European countries after World War 2 and also aimed to prevent the further rise of communism in war-torn nations.