From Dickinson College in PA, "a digital collection of books, pamphlets, letters, and diaries, dating from the latter eighteenth through the early twentieth century, that reflects the history of the United States. This collection currently contains more than 34,500 individual pages of text and corresponding transcriptions, covering a variety of topics, including: colonial American politics; U.S. politics, government, and foreign relations; historical biography and autobiography; slavery and abolition; the American Civil War; the temperance movement; foreign travel; economics; medicine; philosophy; and theology."
72,000 digital images of 12,000 manuscripts of James Madison's "correspondence, personal notes, drafts of letters and legislation, an autobiography, legal and financial documents, and miscellaneous [items]" from 1723-1836.
"George Washington, Benjamin Franklin, John Adams (and family), Thomas Jefferson, Alexander Hamilton, and James Madison. Over 119,000 searchable documents, fully annotated, from the authoritative Founding Fathers Papers projects" of the National Archives.
"no mere digitization of a single archival collection; rather...a heroic effort to reassemble a body of documents believed lost in 1800," [per Choice mag] when a fire destroyed the War Department's "records of its early existence, when the federal government struggled to define its role in the new nation and the War Department was responsible for 70 percent of the federal budget" (Choice mag again). Assembled and maintained by George Mason University's Center for History and New Media. Still growing but expected to include 55,000 documents, fully accessible to scholars and students. Searchable and browsable.
Text of documents written in and about the Americas between 1492 until the 1800s. Maintained by Maryland Institute of Technology in the Humanities at the University of Maryland. Advanced Search via the "Archive" button.
A central portal to access digital collections from the Civil War Era (1850-1865) held by members of the Association of Southeastern Research Libraries (ASERL). More than 10,000 items from 30 libraries. Diaries, letters, photographs, poems, personal narratives, books, newspapers, broadsides, and more.
Manuscripts by and pamphlets, maps, miscellaneous print items, photos and other images, newspaper issues, and sheet music about Abraham Lincoln and the people and events associated with him. Search or browse.
"digital video archive of historical news film allowing learners to be nearly eyewitnesses to key events of the Civil Rights Movement" and digitized archival materials "on the Civil Rights Movement and the struggle for racial equality in the 1950s and 1960s" in over 140 collections held by 91 entities in the U.S. [as per site's About and Choice mag review]. Go through the "Collections A-Z" link to find primary sources.
"both a physical location and a web site...a major repository of material related to the US war in Vietnam" (Choice mag). "The Virtual Vietnam Archive currently contains over 3 million pages of scanned materials. Types of material include documents, photographs, slides, negatives, oral histories, artifacts, moving images, sound recordings, maps, and collection finding aids." Many materials are non-copyrighted, digitized, and available for download. (site info) Some materials must be used on site in Lubbock. Altogether a tremendous resource for researching the Vietnam War.