I have a 1900 census for George Mullins that states residence in 1900 is Township 4, Chickasaw Nation, Indian Territory.

With a statement of such, can we assume he is Indian and on a reservation?

I know to verify if he is Indian or not I have to get Roll and card numbers. I am just curious, because I have seen this in the past and am wondering if it warrants checking further in the matter

Thank you