France, to pick on that one example, has an incredibly bad record of dealing well with immigration. Like, if your ancestors don't all come from France, you're just not cool enough to be considered French. Obviously, the country sat down and planned out a "we'll continue to be distinctive" plan, with the academy that keeps written French grammar complicated and a thriving film industry and trademarks for Champagne and all, but, the problem with enforced distinctiveness is that people sort of have to assimilate or die be outsiders for life.
The US doesn't have an official language, so there's no legal reason not to have the national anthem in as many languages as you can think of. Legal notices in my city are printed in English, Portuguese and Spanish, and they put little sentences at the bottom (This is important have this translated for you) in Thai, Chinese, Vietnamese, Haitian, and a couple of languages I don't recognize. Now, that's my city, and I live in Socialist Massachusetts, but.
We don't have a national policy of enforced distinctiveness (and anyway, in a country this geographically and demographically large, I bet it would be impossible), and I'm cool with that. Just as I am cool with the hilarious gymnastics required to make the Star Spangled Banner rhyme in Spanish.