150 years ago, the same thing would have been said about the Irish, Italians, and Poles, and it didn’t happen; they stopped being minorities and assimilated. That’s what is going to happen again: by 2050 Hispanics and Asians will not stand out any more than Irish or Italians do today, to the sorrow of the race baiters.
I have read in multiple places that in reality, white people are already below 50% in America.
Those are all European races. Europeans founded the United States.