@240B
Not true,but only because what few Asians live in America all tend to live in just a few areas. Like everyone else,they prefer to live with their own "type" where they have shared history and customs.
Takes a generation or two for them,or anyone one else,to truly become "Americans".
Chinatowns are not unique. SF's North Beach area was, and may yet be, an Italian neighborhood. My hometown had a high concentration of Volga German immigrants until it started to grow. Many eastern and midwestern US cities have Polish or Italian or German or ______ neighborhoods. And whether German (like my father and his siblings) or Cantonese (like in SF's Chinatown), many children of immigrants learned English as their second language.
I think the ethnic neighborhood image is a bit overstated nowadays. My neighborhood has had Indians, east Asians, Iranians, Ukrainians, Filipinos, Hispanics, and probably more. OTOH, there are San Jose neighborhoods that are heavily Hispanic or Vietnamese.