Regarding those from “The Old World” this phenomenon isn’t unique to the USA. Most other countries in the Americas, Australia, New Zealand, and South Africa exhibit tying ancestry to not being of the land since time immemorial. It just happens to be that Americans tend to produce the most cultural discussion about it in volume, especially in the English language.

The big thing is recognizing that the culture of the land doesn’t match the culture of your “people”. It can be tough to reconcile that, especially if someone is from a mix of different origins.