If you must identify with some group, there is regional variation of lived experience within the US. Growing up in New York is a good deal different than growing up in San Diego. The outlooks and practices of people in that region form culture. It may not be an ancient culture or associated with genetic trends, but at least it's something you've actually experienced.

That said, I don't like when people ask me where I grew up because I immediately feel judged for something I had no say in.