Use these terms as keywords in your search to help you find primary sources related to your subject. Try to think about in what format/genre the information might have been recorded in.
Another option is to search for your topic, then look at the refining options via "Genre," and then look for some primary source term, as mentioned above.
Example 4: 19th amendment digital collection
Example 5: women's suffrage digital collection
Subject: Interdisciplinary
Content/Description: Provides full-text newspaper articles from the Chicago Tribune from 1849-1998.