1. The Cold War 1945-1991 State of tension and hostility between the United States and the Soviet Union because of differences in political and economic philosophies

2. Iron Curtain Imaginary line drawn through Europe that divided Western democracies from Communist countries in the East

3. Truman Doctrine Economic and military program of U.S. created in 1947 to help countries resist communist aggression Successful in Greece and Turkey

4. Containment Policy that involved limiting communism to areas where it already existed

5. Marshall Plan 1947 American aid plan for Europe to rebuild Goal to strengthen democratic governments to lessen appeal of communism

6. NATO North Atlantic Treaty Organization An alliance between western nations to support each other in case of attack Collective security agreement

7. Warsaw Pact Alliance between the Soviet Union and its satellite nations promising military cooperation Created in response to NATO