I have good (white) friends that adopted and are raising a Native American child. It was a sort of rescue adoption of a compromised infant due due fetal alcohol syndrome. Gained a lot of insights just by witnessing their challenges and issues over the years. I imagine some similar issues with white parent and black child, or black parent and white child.
One important thing they did was to openly support that the child had a place and identity in both cultures. That involved maintaining an ongoing contact with the birth mother, family and tribe. There was a risk of being caught between two cultures that were/are very different from each other and not being integrated into either. The open and friendly relationship got ahead of any resentment or ill will that would have passed through to the child.
Also important that you have a sense of comfort and belonging in a black community. If you do or don't, that will rub off on your child who will need a sense of belonging on both sides of the race line.