Many of the Koreans in LA got here by claiming oppression in Korea. The they brought their family members in, also legally, but they cling to Korean culture and language. Don't believe it? Go to central LA where you will see only Korean signs on buildings. Are they better citizens than Latinos? Youy bet they are!
Years ago two friends and myself drove down Huntington Blvd (I think?) in East LA after playing volleyball at East LA College, looking for something to eat.
I swear, we could not read any of the signs, to even give us a *hint* of something edible. It was as if we were in the middle of a foreign country.
And as you know, with that culture, you kind of have to be careful of what you ask for, LOL.
In Chicago, which is near where I grew up, there were neighborhoods in which all the signs were in Polish, others in which all the signs were in Slovak, others in which all the signs were in German or Bohemian. Everyone spoke fractured English, if any. Even 25 years ago when I was in grad school in Little Italy, the black-clad, babushka-ed Italian grandmothers would sometimes stop me on the street--me, a blonde girl and obviously no relation of theirs--and rail at me because my skirts were too short for a Sunday afternoon. They did this in Italian, not English.
Today, however, the children of all those people are as American as apple pie, and their grandchildren, the same age as my kids, are only vaguely aware of their ethnic heritage. The same happens to the second- and third-generation Korean kids (at least in my area: Washington DC).