- "Big Stick" policy: the Roosevelt Corollary, when TR pledged to keep order in Latin America by force
- Capitalism/ Free Enterprise: the economic system of the US, where people own the businesses
- Communism: a form of government without social class where the government controls business and production
- Democracy: when citizens have a say in government and civic responsibility
- Depression: a severe drop in the economy
- Economic: dealing with money, jobs
- Foreign Policy: how a nation treats other nations/regions of the world
- Imperialism: when a powerful nations dominates a weaker nation
- Industrialism: the move from farms to factories, when a country focuses on business and factories
- Intolerance: refusing to accept others as equal
- Nationalism: extreme pride in one's country
- Political: related to government, laws
- Progressive Reform: changes made to help American lives improve
- Social: culture, relating to others
- Supply and Demand: the economic idea that a product's price depends on availability and consumer desire