This page provides access points for some of the major digital collections with content about New England (north-eastern United States with Maine, Vermont, New Hampshire, Massachusetts, Rhode Island, and Connecticut). At the moment, content focuses on Rhode Island and Massachusetts.
Contact your history librarian if you have questions or suggestions on expanding focus.
This page has a lot on it. You can use the following anchors (links down the page) to jump straight to a relevant box.
For Boston specific material, see BC Libraries' Boston History Research Guide.