My example of immigrants was not to imply anything about non-immigrants. I used them simply because they're easy to distinguish (yes, profiling, I guess).
I've definitely seen the same in non-immigrant families. Perhaps more likely from folks who do not come from major cities (I may be wrong). Definitely tend to see it more amongst LDS folks, but it's by no means limited to them.
I understand what you mean, I believe it was me who made that generalization first. It's hard to refrain from trying to make things follow a simple and explainable pattern.
I've definitely seen the same in non-immigrant families. Perhaps more likely from folks who do not come from major cities (I may be wrong). Definitely tend to see it more amongst LDS folks, but it's by no means limited to them.