The latter generations mixed by ethnic heritages: Italians with Irish, Greek with Polish, all sorts of people today can not say with certain that they are pure anything.
The future generations do to different hertiages currently immigrating legally and illegally, will be all sorts of mixed colors and races. Hispanic with white, black with white, asian with hispanic, etc, etc, etc.
My thoughts don't mean I am for forced diversity, but peoples will eventually mix cultures. I'm all for it as long it's an American culture, which is the real problem today with celebrating diversity which means changing Americans culture by force.
Hispanic is NOT a race for Chrissakes and mixed ethnicity and mixed race is not the same.
And in case anyone missed this little fact.
It's not about group physical characteristics.
It's about culture and assimilation.
Now...how culture is formed by specific shared physical characteristic groups can be argued until whites are a minority here and still no one will have a clear answer.