My family's been in this country a long time, almost entirely in Virginia and West Virginia. My most recent immigrant ancestor is a maternal 4th-great grandfather who came over from Ireland. Most of my lines have been in the U.S. as far as seven generations back; those that we've traced further to their original homelands came mainly from England, Ireland and Wales; Germany and Prussia; and the Netherlands. There's also a touch of French in with the Anglo-Celtic, Germanic and Dutch. There's a family belief that there was "dark blood" (probably originally meant derogatorily, and I do not use the term myself) about five generations back in a particular line, and most in that family have chosen to interpret this as meaning Native American, which did marry into some of the non-direct lines of my ancestry, but which I haven't yet been able to confirm in my own direct line. Rather, I suspect this might have meant African slave ancestry, but it's also possible that it referred to a 5th-great grandmother in that line whose maiden name, circumstantially, at least, might be Jewish.