Pretty interesting. Trace regions can be a fluke but if your family tree in America goes back many generations (and it sounds like it mostly does considering you also have a bit of Native American in your background), then African ancestry is more likely. Ironically, white Southerners are far more likely to have African ancestry than white Americans from other regions of the country on account of having families who are more likely to have been here since colonial days, plus from living in close contact with Africans via slavery. The average African-American is said to have anywhere from 15-20% European admixture. So, it makes sense that the admixture goes the other way too, in that many white Americans have some distant African ancestry but may not know it. I'd imagine far more white Americans have distant Native American ancestry, though I'm just speculating on that.