This website contains age-restricted materials including nudity and explicit depictions of sexual activity.
By entering, you affirm that you are at least 18 years of age or the age of majority in the jurisdiction you are accessing the website from and you consent to viewing sexually explicit content.
As I understand it, that’s a French thing specifically, not just a non-USian thing. Like, if you’re a citizen of France, you’re expected to be French and assimilate into that culture, no matter whether you’re a native Parisian, you moved there from Algeria in the '60s, or you’re from some random other place and got citizenship via the French Foreign Legion. It’s a specific sort of national ideology that’s different from the American “melting pot” one.
I’ve generally heard the opposite. You can immigrate to France, get citizenship, and be as French as possible, but you will never be French.