Heck, that’s even a line of questioning that can be posed about the American-born in those different classes, isn’t it?
On the Immigrant issue, I’m with Der’s first post. It is imperative that an immigrant quickly become able to converse with and interact in everyday public environments with the mainstream community, including both acquiring language skills and adapting to what are the general social norms and expectations, if a better life is expected. The new and 1st-gen immigrants should make an effort to integrate and that effort should be reciprocated positively. Meaning that the encouragement to integrate should NOT take the form of institutionalized hostility to, or derision of, those parts of the old ways that do not harm third parties. IOW: “We will make it worth your while to fit in where it’s important” , not “We will make you sorry to be different at all”.
Assimilation, meanwhile, will take care of itself with the passage of time; you can’t ram it down people’s throats any more than you can immunize completely against it* or against it going both ways*. By the time it happens even the original mainstream cultures will have evolved from where they used to be anyway. I often mention to fellow 'Ricans who fret about it, that since I’m currently not speaking Taino or Mozarabic or Latin, or pledging my loyalty to their Catholic Majesties, I have no standing to demand that my great-grandchildren be Spanish-speaking Christians singing “Verde Luz” calling themselves “Boricua”.