Pittsburgh is a delightful city! A rich melting pot of ethnicity and nationality.
My strong suspicion: Given how much cross-breeding has occurred throughout history (both in Europe and in North America) the concept of “nationality” as seen through genetic profiling seems rather strained.
What’s more, nationality is a human construct - not a biological one.
I don’t doubt that genetic associations aligned with political boundaries exist. But given how often national borders have changed and how much genetic mixing has occurred over the centuries, I remain skeptical that retail genetic test results can reveal a meaningful “nationality.” Such results are likely more a response to what customers are looking to purchase than a meaningful scientific finding.
Having said that, if someone is related to a serial killer somewhere nearby in their gene puddle, 23&Me can help the authorities narrow their search