hell I'm European, and I've had intercourse with more than a few Native American women .
Funny thing about Ancestry, the branches tend to go ALOT further than you think, I'm from the UK, my mum and her mum are both born and bred UK citizens.... yet I can trace my Maternal line back to one of the old kings of spain, and some Vikings. Am I spanish or a Viking? No, but I have some of their blood in me.. a tiny tiny bit , and that's just from my Maternal line, add in the Paternal line, and I'm sure I can find traces from all over the place.
You'd be VERY surprised what happens when you do a little digging, especially if you're from a place like the UK, or the US, which has had settlers from all over, been ruled by different people etcetc.
just to get back on topic, AC3... FRAK yeah