19th Century Masterfile : Contains core US and UK periodicals and newspapers from 1802-1906.
Accessible Archives : Contains several collections from the 18th-19th centuries including "The Civil War: Part I: A Newspaper Perspective" and "African American Newspapers: the 19th Century."
America's Historical Newspapers : This database reproduces and indexes over 700 U.S. newspapers covering 1690 to 1922, with a special emphasis on Texas and other states west of the Mississippi River.
ProQuest Historical Newspapers provides full text and images for major US and African American newspapers dating as far back as 1764. All of the ProQuest Newspapers use the same interface and allow for targeted searching using various limiters (e.g., date, section, etc.). Please note: Historical Newspapers may not be searched simultaneously with non-historical papers.
World Newspaper Archive (Readex) : This database provides many historical titles from North America, but is also a good source for finding historical African and South American papers.