U.S. History
- Independent Treasury System
- Individualism
- Industrialization
- Inland water transportation
- Instructional materials industry
- Insurgents
- Integration
- Interest Groups
- interests
- Internal Migration
- Intolerable Acts
- Intrepid
- Iran hostage crisis
- Iran-contra affair
- Iranian Americans
- Iraqi Americans
- Italian Americans
- Ivy League
- Japanese American Incarceration
- Japanese Americans