But there are a few collections that are subject or ethnic group based. Here is a list of several of the ones that I have researched and a list of links composed for you.
I am sure that there are several others, but these are some of the largest, and most are free for you to search:
- African-American Online Historical Newspapers Summary - Updated 2015
- College Newspapers
- Hispanic American Newspapers - this requires a subscription; however might be available at your nearby University library, so check with them
- Historic American Farming Newspapers - Updated 2015
- Historic German American Newspapers - Updated 2015
- Historic Irish American Newspapers Online - Updated 2015
- Historic Jewish American Newspapers Online - Updated 2015
- Japanese Internment Camp Newspapers and More!
- Shanghai Jewish Newspapers During World War 2
- Pennsylvania Civil War Era
Take a look at these and remember to include in your research not just collections based on location.
For the U.S., You might want to use those titles available from Chronicling America and choose an ethnicity or language to hone in on specific titles of interest to you.