You can find African-American newspapers in such collections as ProQuest Historical Newspapers, Readex America's Historical Newspapers, Accessible Archives, and Chronicling America.
ProQuest titles in its Historical Newspapers collection reproduce a publication's text-searchable text as articles, entire pages, and complete issues;
Readex African American Newspapers, Series 1 and African American Newspapers, Series 2, contain more than 350 titles, primarily but far from exclusively from the nineteenth century. Publication runs may be incomplete or comprised of a handful of issues.
Accessible Archives African American Newspapers presents leading nineteenth- and twentieth-century American and Canadian publications.
Chronicling America includes more than 250 African-American newspapers, primarily but not exclusively from the nineteenth and early twentieth centuries. Publication runs may be incomplete or comprised of few or only a single issue, while other runs are extensive. Speak to your liaison librarian about text analysis via Constellate for all newspapers in Chronicling America and more.