Selected online digitized sources:
Colonial charters, grants and related documents (Avalon Project)
Maps: exploration and discovery / American Revolution (American Memory)
Maps of the Middle Atlantic Region to 1850 (New York Public Library)
Plymouth Colony Archive Project
Lapidus Center for the Historical Analysis of Transatlantic Slavery
France in America (Library of Congress and BNF)
Salem Witch Trial Documentary Archive
Records of the American colonies (Hathi Trust)
Early Americas Digital Archive
Archive of Early American Images
Indians of the Midwest (Newberry Library)
The American Constitution - a Documentary Record (Avalon Project)
Documents from the Continental Congress and the Constitutional Convention (American Memory)
Founders Online (papers of Washington, Franklin, Hamilton, Madison and Adams)
Congressional Documents and Debates, 1774-1873 (American Memory)
Works of Jonathan Edwards (Yale)
The Early Caribbean Digital Archive
Papers of the War Department (1784-1800)
Winthrop Family Papers (Mass. Historical Society)
Revolutionary era Boston newspapers
Native Northeast Portal (primary source materials by, on, or about Northeast Indians from repositories around the world)
The rare books collection at the University Archives and Special Collections contains original books and pamphlets documenting colonial and early U.S. history.
For example, the collection includes
Search for them in OneSearch, limiting your results to the location facet: "Special Collections."
18thConnect
Portal to digital primary and secondary sources on the long 18th century.