This free site from the Library of Congress allows you to search and view newspaper pages from 1789 - 1925 and find information about American newspapers published between 1690 - present.
Sponsored by the National Endowment for the Humanities and the LOC as part of the National Digital Newspaper Program.
An extensive collection of regional newspapers produced by Ancestry but not accessible through Ancestry. Available as a separate personal subscription on top of Ancestry.