America is no longer a "melting pot" of cultures but rather an "A la Carte" culture of communities that have no desire to assimilate into American society.
That's sure how the bureaucrats see it; when the immigrants are asked, they want their kids to learn English. If the school would have told my grandmother back in the early 1900s that they were going to teach her American-born son in Yiddish or Russian she would have looked at them as if they were crazy.
True though often some European immigrants would live in their own little enclaves for a time. My ancestors though did try to adapt to the culture. I do see some here that do and some that don't.