There are lot here in the US who believe in a fictional cultural homogeneity despite our short and diverse history in comparison to European and Asian cultures.
These folks are among the xenophobic anti-immigrant faction of MAGA, and are very good at couching their prejudice as a defense of these alleged "American values," but fail to explain why our culture is really endangered by people seeking more economic and personal freedom. They co flare the recipients of government largesse with the cause of government extortion, externalizing the blame.
I understand the concern of cultural dilution, but history shows us culture is not static, languages evolve, and culture is far from concrete. We must choose what to preserve, what to adapt, and what deserves to be abandoned. It's uncomfortable, but growth isn't easy, and change is rarely fun.
And this is what it comes down to. If culture was a fridge, you'd throw out the mouldy inedible foods, and fill it with what provides sustenance, right?
A while back, memes were circulating on web2 reminding us that tradition is just peer pressure from dead people. I'd never advocate discarding objects, ideas, or traditions just because they are good any more than I cheer for embracing whatever new replacements are proposed. Neither antiquity nor novelty has intrinsic value on its own.