Open Access Primary Sources
Boston History
The Boston Globe (get an e-card through the Boston Public Library)
Boston Streets: Mapping Directory Data
The Elizabeth Murray Project (American Revolutionary era)
General US History Sources
Digital Public Library of America (images, publications, manuscripts)
Chronicling America (Library of Congress newspaper database)
Library of Congress (images, publications, manuscripts)
Smithsonian Institution collections (images and artifacts)
Internet Archive (movies, texts, images, old websites)
National Geographic (get an e-card through the Boston Public Library)
Historical Census Browser (1790-1960)
Activist Video Archive (oral histories)
Ad*Access (print ads from 1911 to 1955)
Ad*Views (television commercials from the 1950s through the 1980s)
Chicago History
Race and Ethnicity History
Black Quotidian: Everyday Life in African-American Newspapers
Digital Library on American Slavery
First 100 Days Project (Immigrants' experiences of their first 100 days)
Immigration to the United States, 1789-1930
Japanese American Relocation Digital Archive, 1941-1946
Korean American Digital Archive
Mirror of Race (photographs)
National Museum of African American History and Culture
National Museum of the American Indian
Japanese American Relocation Digital History Archive
Schomberg Center for Research in Black Culture
South Asian American Digital Archive
Gender and Sexuality History
Click! (sources on late 20th-century feminist movements)
Crusade for the Vote (suffrage movement)
Military History
Politics, International Affairs, and Military History
Secondary Sources
Common-Place (includes articles on American history from the colonial era through the 19th-century)
JSTOR (includes some primary too, get an e-card through the Boston Public Library)
Massachusetts History Online (secondary sources, get an e-card through the Boston Public Library)