U.S. History
- Treaty of Washington
- Treaty Regarding the Sale and Lease of Properties Across the Isthmus of Panama for the Construction of a Ship Canal 1903 United States-Colombia
- Trent Affair
- Triangular trade
- Trucking
- Truman doctrine
- Trust companies
- Trusts
- Truth in Lending Act
- U-2 incident
- Underground Railroad
- Underwater exploration
- Union party
- Unions
- United Kingdom. Molasses Act 1733
- Unsafe at any Speed
- Urban renewal
- Urban Riots
- Utopian communities
- Viagra