| Term | Definition |
| Expansionism | the idea that a country should grow through purchases, agreements, or force |
| Cold War | the conflict between Communist and Capitalist countries after World War II |
| Interdependence | the idea that all societies and connected important to each other |
| New Deal | Franklin Roosevelt's plan the end the Great Depression |
| Homefront | the US during our wars |
| United Nations | a world organization for peace that recognizes many member countries |
| Alliance | a group of nations that come to each other's aid in time of war |
| Holocaust | when the Nazis killed 6 million Jews and 5 million others during World War II |
| Prosperity | good economic times, when there is low unemployment and business growth |
| Terrorism | striking fear into a population through destructive acts |
| Immigration | moving from one country into another |
| Diversity | having mixed cultural and ethnic groups |
| Urbanization | the growth of cities |
| Civil Rights | the legal rights of a citizen |
| Ethnic | the background of a person, their culture |