| Term | Definition |
| cold war | a state of political conflict using means short of armed warfare |
| containment | A goal to stop the spread of communism. The US had to use military and non military actions to stop the spread. |
| Truman Doctrine | President Truman's policy of providing economic and military aid to any country threatened by communism or totalitarian ideology |
| Marshall Plan | a United States program of economic aid for the reconstruction of Europe (1948-1952) |
| Berlin Airlift | airlift in 1948 that supplied food and fuel to citizens of west Berlin when the Russians closed off land access to Berlin |
| Berlin Wall | a wall separating East and West Berlin built by East Germany in 1961 to keep citizens from escaping to the West |
| NATO | North Atlantic Treaty Organization; an alliance made to defend one another if they were attacked by any other country; US, England, France, Canada, Western European countries |
| Warsaw Pact | An alliance between the Soviet Union and other Eastern European nations. This was in response to the NATO |
| United Nations | an organization of independent states formed in 1945 to promote international peace and security |
| Bay of Pigs Invasion | failed invasion of Cuba in 1961 when a force of 1,200 Cuban exiles, backed by the United States, landed at the Bay of Pigs. |
| Cuban Missile Crisis | the 1962 confrontation bewteen US and the Soviet Union over Soviet missiles in Cuba |
| NASA | National Aeronautic and Space Administration - a US government agency in charge of the space program |
| Guerilla | refering to surprise attacks or raids rather than civilized warfare |
| Vietcong | South Vietnam Communists |
| Domino Theory | the political theory that if one nation comes under Communist control then neighboring nations will also come under Communist control |