I wasn't thinking of Israel tbh. That is a unique situation in the world, but is still kind of an example I guess. But many other countries were actually various territories until they became countries on the world stage. We tend to think of the U.S. as a young country, but there are a lot of countries that are just as young or younger, but the peoples lived in the physical places much longer. Iraq, Italy, Germany, Yugoslavia breaking up, etc. Territories are either conquered and annexed or some other people in the world participate in drawing borders around a place in the way they want to do business with it. Idk. I just think it doesn't always happen because the peoples themselves identified themselves that way at all.
I am half Ashkenazi with Austrian, Hungarian, Russian, and Polish ancestry, and half Italian. 3rd or 4th gen American depending on which line you're looking at.