I'm melanin-deprived...My ancestors on my Mom's side were thrown out of Scotland, and dodged a Franco-Prussian draft on my Dad's. I stand firmly behind my genetic heritage as an exile and draft-dodger.

Kitian-Basques are genetically unique, while everyone around them all share the same pool of genes, because they presumably migrated in later.
For those not from here...
Americans mostly have odd family quirks and such that are cultural holdovers from what European country and what region they are from. For instance, someone who has parents from an English, Irish, Scottish or German background might be likely to grow up eating bland food. (Mostly, I ended up eating things that came in a box and said "Hamburger Helper ". Mom's hamburger needed lots of help.)
Unless, of course, those English/German/Irish/Scottish ethnicity people are from Southern states, which took up spicing ideas from the large number of mostly Nigerian people who...ahem...ended up in the Americas not by choice. Barbeque was brought to us by way of Africa.
Also, Southern dialect can be related in small part to Nigerian.
Our structure of government was inspired by that of the Iroquois Nations. At the beginning, we had so many German immigrants that we could have ended up being a German-speaking country.
Yankees (from the northeast) generally speak faster and seem, from a perspective of southern manners, to be a bit blunt and rude at times. Interestingly enough, an accent I think of as "New York"-well, I worked with a Bosnian guy, and he sounded so Brooklyn it wasn't funny. I suspect the influx of Eastern Europeans in the 1800's is what made the NYC accent.
OTOH, when you get an elderly southern gentleman flirting with the counter-girl ahead of you at the hardware store when you're in a hurry...um, blunt can seem attractive.
Here in Texas, having seen the driving, and for one terrifying day, drove, in Mexico...we drive like Mexico lite here. We have a critical mass of transplant drivers, and you have to drive just as cutthroat as they do. Or be cursed to miss your exit forever.
Although our stop signs aren't suggestions. Mexico's are.

The predominant number of freshly here people are Mexican. But they listen to Tejano, which is a cross between Mariachi and German polka. Oh, yes, the inexpensive Chinese and Indian places here...all use jalapeno peppers in their cooking. At 50 cents a pound at the big farmer's market, well...hey, price is good!
And if I ever move away from this city, I'm really going to miss the salad of ethnic communities we have here. I like multiculturality.
Someone at my current job actually found a Chinese matchmaker-who lives here-to find himself a wife, because you can't talk to a traditional Chinese woman directly. Not at all.
Anyway-
The way it works is this: New immigrants never do totally leave behind their birth culture. Their kids assimilate fully. The grandkids circle back and reclaim their ethnic heritage.