so the arbitrary definition "have be born in this country" is used instead
That hardly seems arbitrary -- it's what the word means. If you were born outside the country then you have immigrated, therefore you are an immigrant.
Well it may seem a bit arbitrary to those who grew up in the U.S. but were born elsewhere (or even to those who were born in the U.S. but grew up culturally isolated).
That hardly seems arbitrary -- it's what the word means. If you were born outside the country then you have immigrated, therefore you are an immigrant.