Yeah, fast changing demographics means fast changing values.People that come in mass from failing or disfunctional or just very different societies can and do bring with them "incompatible" values. Us modern ability to integrate / assimilate people in mass is probably ovverated, expecially in a fast paced mass migration scenario of a multiethnic society. the future is probably some version of Brazil

Usa got lucky integrating most europeans first and skilled immigrants later. but it struggled with other demographics, notably afro-americans, native americans