Period 6 (1865-1890) - Resources
- Website - The Gilder Lehrman Institute of American History (Timeline, Documents, Additional Videos)
- Video - Adam Norris - Review Videos
- Video - Crash Course History - "The Rise of the Industrial Economy: Crash Course History #23"
- Video - Crash Course History - "Westward Expansion: Crash Course History #24"
- Video - Crash Course History - "Growth, Cities and Immigration: Crash Course History #25"
- S. Source - Push and Pull Factors - Immigrants
- S. Source - Population for the Select U.S. Cities
- Video - Crash Course History - "Gilded Age Politics: Crash Course History #26"