The One-Drop Rule was established during the late 1800s and early 1900s, when racial classification laws were being passed. Under this rule, anyone with one drop of African blood was classified as Black.
During that period, it was not uncommon for native Americans to form bonds with Africans, called Negroes. According to the One-Drop Rule, the child of a Native American and a Negro would be classified as Black. As harmless as this “label” may have seemed, it excluded many natives from tribal affiliation, thereby stripping them of their heritage and rights.
Blacklisted Native Americans – blackindiansunited5tribesembassy.org
For those of you who have started researching your ancestry using census and vital statistics records, you may keep running into the classification of “Black” or “Negro.” This doesn’t rule out native American ancestry. It just means at least one of the parents were African. The other parent could have been from here, so keep digging. This is where retrieving oral stories from elder relatives becomes important. When I interviewed my relatives, I was surprised to find out how many of the grandmothers were so-called Indian.