Sure, my family emigrated here: my father, who was born here as a first generation American--was just that; an American. He had No trace of an Italian accent (altough his parents barley spoke intelligible English), and in fact he forgot how to even speak Italian. He fought in WW2 as did his brothers (who were also American and spoke flawless English). They (my father and his brothers all got together and started a business after the war--though not a Fortune 500 company they earned an above average mid income living).
I contrast this with literally dozens of people I know, some good friends of mine who are here to only make money so they can return back to the native country--they do not consider themselves to be American, nor do they consider America their home, and indeed still refer to their native land as "my country". American can function as a Nation with some residents having this visitor attitude--but Not with 10s of millions of people who simply reside here. It's common sense.