- 1911 Encyclopedia
- American Rhetoric (famous speeches from American history, and related resources)
- American Memory (Historical Collections for the National Digital Library (Library of Congress)
- Historical Documents and Maps (Bedford/St. Martins Collection)
- USMA Military History Maps
- Questia: Online Library
- HathiTrust (electronic library)
- Infoplease: a Pearson Education Resource
- Immigration (Harvard)
- Making of American Project: Cornell (19th-century American books and periodicals)
- U.S. Historical Documents (Univ. of Oklahoma College of Law)
- History Matters
- American Journeys: Eyewitness Accounts of American Explorers, 1000 A.D. to Present
- Online Library of Liberty (“Classic works on art, economics, history, law, literature, music, philosophy, political theory, religion, science, sociology, war and peace.”)
- Making of America Project: Michigan (19th-century American books and periodicals)
- Documenting the American South (over 1200 books and manuscripts)
- Dictionary of the History of Ideas
- U-S-History.com (Chronologies, Documents, Etc.)
- Modern History Sourcebook
- Minnesota Reflections Digital Library
