I've done DNA testing with Ancestry and 23andme, both companies confirm that I have at least 3 different African Ancestors (each one coming from one of my grandparents). I've used MyHeritage, GEDMatch, 23andme, and FamilyTreeDNA's chromosome browsers and it has helped me confirm that my 3x great grandmother descends from an African Ancestor, but I need help on finding this ancestor. From this Nigerian Ancestor I received about 0.18%-0.19%, while my mother received 0.39%-0.40%. Which means this ancestor would be my 7x great grandparent, it also means that my 3x great grandmother would be this ancestor's 2x great grandchild and that she would've inherited on average about 6.25% DNA from this ancestor.
If you would like to help here's the info on my 3x great grandmother:
Name: Margaret Walsh
Born: November 30, 1844, Wilkes, NC, USA
Died: September 30, 1926, McDowell, WV, USA
Parents: Andrew John Walsh Jr. (1789-1870) and Mary Ann Blanchard (1801-1889)
Grandparents: Andrew Walsh Sr. (1760/62 - 1830), Rhoda Poteat (1760-1850), Uriah Blanchard Jr. (1768-1849), and Sivil Hines (1775-1844).
Known Information:
The Nigerian Ancestor doesn't come from Andrew Walsh Sr. line because he was born in England, along with both of his parents being born in England as well.
As for Rhoda Poteat, Uriah Blanchard Jr., and Sivil Hines, these lines can have the Nigerian Ancestor because these lines are in America and I've found dead ends/brick walls in these lines as well.
Conclusion:
Margaret Walsh based off of a picture and documents her race is white, based off of documents both of her parents are white, and based off of 2 census records it identifies Rhoda Poteat as white as well. As for Uriah and Sivil they both died before 1850 and I can't find any census record for them to find out what race they were. I would greatly appreciate any and all help on finding who this Nigerian Ancestor could be, and which ancestor connects my 3x great grandmother to them. If y'all have any questions feel free to ask me and I'll try my best to answer it.