Dear Mr. Robinson,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the Population Schedules for the 1850 Census, the Population Schedules for the 1860 Census, the Population Schedules for the 1870 Census, the Population Schedules for the 1880 Census, and the Population Schedules for the 1890 Census in the Records of the Bureau of the Census (Record Group 29) that may contain information about S. Perthenia Robinson and Harvey Robinson living in Illinois. On the census, her race was listed as white. For more information about the non-digitized schedules, please contact the National Archives at Washington, DC - Textual Reference (RDT1) via email at firstname.lastname@example.org.
You may wish to search Ancestry or FamilySearch for the U.S. Census. There may be a fee for using Ancestry. Instead, please check for access at your local library as many library systems subscribe to these sites, making them free for their patrons.
Due to the continued impact of COVID-19, you may experience a delay in receiving an initial acknowledgment as well as a substantive response to your reference request from RDT1. We apologize for this inconvenience and appreciate your understanding and patience as we balance mission-critical work and the safety of our staff during the pandemic. Please check NARA’s web page about COVID-19 updates for the latest information.
We suggest that you begin by talking to your various family members, especially the more senior ones, and ask them questions so you can gather names, dates, places, and stories. With that information in hand, you may begin to gather records about these family members and the places associated with them. In addition, the NARA Native American Heritage webpage, NARA Resources for Genealogists webpage, and the FamilySearch Research wiki for Indigenous Peoples of the United States Genealogy may be useful.
Lastly, we suggest that you contact the Illinois Department of Public Health to request a copy of the death record for S. Perthenia Robinson that should include information about her race. You may wish to search the FamilySearch wiki for Illinois Vital Records.
We hope this is helpful. Best of luck with your family research!