I could give you a theory on this, I suppose, since I’ve read bunches of them. Instead, I’ll tell you a story and hope I’m not violating the privacy of people I respect.
I have neighbors who are from Vietnam. At least one of the neighbors doesn’t seem to speak English. Despite this, through common humanity, charity and grace, we have communicated. I don’t think that “forced assimilation” is necessary through government means or even personal means. My acquaintance never asked me to change. I never asked her to change. We hand-sign, smiled, bowed and exchanged gifts. This is my advice on differences like these.