Dear Mr. Pack,
Thank you for posting your request on History Hub!
For an overview on how to begin your research, we suggest that you review NARA’s Native American Heritage as well as the FamilySearch Research wiki for Indigenous Peoples of the United States Genealogy. We suggest that you interview your various family members, especially the more senior ones, so you can gather names, dates, places, and stories.
With that information in hand, we suggest that you search the Dawes Final Rolls and the Blackfeet Agency Census for your Cherokee and Blackfeet lineage. Please note that the records in the custody of NARA often only detail those living on the reservations or being administered by the Bureau of Indian Affairs. If an ancestor was Native American and left the reservation or did not have interaction with the United States Government as such, they will not be recorded in NARA’s records and tracing their genealogy may be difficult.
We hope this is helpful. Best of luck with your family research!
[Information provided by Cody White, Subject Matter Expert]