Milestone documents
NARA – Charters of Freedom (Declaration of Independence, Constitution, Bill of Rights)
NARA – Featured Documents
The Emancipation Proclamation
Library of Congress - Primary Documents in American History
National Archives and Records Administration: Our Documents: A National Initiative on American History, Civics, and Service
National Endowment for the Humanities - Northern Illinois University Libraries, American Archives: Documents of the American Revolution, 1774-1776
The Journals of the Lewis and Clark Expedition Online
The Salem Witchcraft Papers
University of Virginia
Key Documents in American History/Digital History