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ProQuest’s openly available Black Freedom Struggle website features 2,000 expertly selected primary source documents – historical newspaper articles, pamphlets, diaries, correspondence and more – from pivotal eras in African American history. 
Chronicling America is a Website providing access to information about historic newspapers and select digitized newspaper pages, and is produced by the National Digital Newspaper Program (NDNP). NDNP, a partnership between the National Endowment for the Humanities (NEH) and the Library of Congress (LC), is a long-term effort to develop an Internet-based, searchable database of U.S. newspapers with descriptive information and select digitization of historic pages. 
This online collection presents newspapers edited by Frederick Douglass (1818-1895), the African American abolitionist who escaped slavery and became one of the most famous orators, authors, and journalists of the 19th century. 
The Frederick Douglass Newspapers collection contains more than 565 issues of three weekly newspaper titles, which have been digitally scanned from the Library of Congress collection of original paper issues and master negative microfilm.
A discontinued project by Google to scan and index historic newspapers. The Google News Archive is still available and a great resource that makes many difficult to find newspapers available freely online. 
The HathiTrust Digital Library is home to millions of digitized books and publications. HathiTrust was founded in 2008 as a not-for-profit collaborative of academic and research libraries now preserving 19+ million digitized items in the HathiTrust Digital Library. They offer reading access to the fullest extent allowable by U.S. and international copyright law, text and data mining tools for the entire corpus, and other emerging services based on the combined collection. 
The HathiTrust Digital Library is home to millions of digitized books and publications. HathiTrust was founded in 2008 as a not-for-profit collaborative of academic and research libraries now preserving 19+ million digitized items in the HathiTrust Digital Library. They offer reading access to the fullest extent allowable by U.S. and international copyright law, text and data mining tools for the entire corpus, and other emerging services based on the combined collection.
Historic U.S. Free Online Protestant Newspapers is a list of free online historic Protestant newspapers from across the Unites States. The list is broken down by state and dates range from the early 1800s to today. 
Independent Voices is an open-access digital collection of alternative press newspapers, magazines and journals, drawn from the special collections of participating libraries. 
These periodicals were produced by feminists, dissident GIs, campus radicals, Native Americans, anti-war activists, Black Power advocates, Hispanics, LGBT activists, the extreme right-wing press and alternative literary magazines during the latter half of the 20th century.
Indigenous Newspapers in North America aims to present a diverse and robust collection of print journalism from Indigenous peoples of the US and Canada over more than 9,000 individual editions from 1828-2016. 
Representing a huge variety in style, production and audience, the newspapers include national periodicals as well as local community news and student publications. The 45 unique titles also include bi-lingual and Indigenous-language editions, such as Hawaiian, Cherokee and Navajo languages.
Newspapers.com World Collection is an extensive database that provides online access to 4,000+ historical newspapers. Dating from the early 1700s into the 2000s, Newspapers.com Library Edition contains full runs and portions of runs of well-known, regional, and state titles to small local newspapers in the United States and other countries. 
Oklahoma Digital Prairie provides visitors unique digital content spanning more than 100 years of rich, vibrant history from the 46th State. The resource areas include documents, photographs, newspapers, reports, pamphlets, posters, maps, and audio/visual content. Content ranges from the late 1800s to the present day. 
Collections include documents state government records from the Tulsa Race Massacre; correspondence, newspaper clippings, and publications for and against, women's suffrage in Oklahoma; documents related to the 1948 Ada Lois Sipuel legal case against the University of Oklahoma law school; and much more.
Digitized by the Oklahoma Department of Libraries, this collection includes 285 prisoner newsletters, dating from 1937 - 1973, written by inmates at the Oklahoma State Penitentiary and Oklahoma State Reformatory. 
The Restoration History Library includes digitized journals, books, and papers related to the Restoration Movement. 
The Southern Baptist Historical Library and Archives is a worldwide center for the study of Baptist history. Governed by the Council of Seminary Presidents, the SBHLA is one of the major denominational collections in the nation and serves, by assignment of the Southern Baptist Convention, as the central depository and archives of SBC records. 
Digital resources include the Southern Baptist Convention Annuals (1845 - Current), Mission Journals, the Baptist and Reflector Newspaper, Pastor's Conference Sermons and SBC Presidential Addresses, and Southern Baptist Historical Library and Archives Photographs.