The only first generation folks who ever acculturate into the U.S. came here when they were under 12. The rest never quite leave the old country behind. Their kids, however, are always Americanized, including speaking English (which alot of Freepers refuse to believe). This is as true of the Colombians/South Americans who were my neighbors in Miami, as it is for the Chinese and Middle Eastern kids who were my neighbors in SW Brooklyn.
The patterns are different.
On the upper end of the scale, you have the so-called NYLON types, etc. who never really settle anywhere. They just keep bouncing around. But they typically know four or five different languages very, very well.
On the middle-to-low end of the scale, you have much larger groups who remain connected to the “old country” through internet, cheap phone, cheap travel and cable television. There’s really no desire to assimilate. A hundred years ago immigrants who were here were stuck here. Not so today.
It’s going to take at least two generations to produce full-fledged Americans.