That is highly useful, but you should know that there are a lot of "special collections" that are based on a specific ethnic group, religion, event, or even occupation.
If you are looking for special U.S. collections, you can use Chronicling America to hone in on them. For specific ethnic oriented collections you can do a search on the Library of Congress Chronicling America site. Click on "All Digitized Newspapers" and then click on "Ethnicity". There you will have the option to find newspapers in that collection such as African-American, French, German, Indians of North America, Irish, Jewish, Latin-American, Mexican, Pacific Islander, and Spanish. You can also search for newspapers in 6 different languages.
Below I have summarized links to a few of these special collections for you, accumulated from a variety of sources.
You can check these out here:
- African-American Online Historical Newspapers
- Historic American Farming Newspapers
- Historic German American Newspapers
- Historic Irish American Newspapers
- Historic Jewish American Newspapers
- Japanese Internment Camp Newspapers and More
- Shanghai Jewish Newspapers During World War 2
- Pennsylvania Civil War Era
And here are some links to special collections available elsewhere:
- College Newspapers
- Hispanic American Newspapers - this requires a subscription; however it might be available at your nearby library, so check with them
Many university libraries have access to special collections as well. There are too many to name here so I recommend checking with your university library of choice and see what they have available. Most require community access registration for access online.
So check out ethnic, language and topic-based collections. You just might find some nuggets about your ancestors not available anywhere else!