Anyone ever dig into why Euro people let Africans and Muslims into their countries? Someone posted comparison of Croation celebration of runner up to World Cup vs. stupid degenerate French "celebration"

Why the hell would they let a people with subpar culture into their homelands? They defended those lands for 10,000 or more. What the hell happened last few decades?

Please anons, I have to know. US of A was always mixed up but for nearly 200 years our leaders wanted only Euro immigrants. How does this culture change in just a few decades?