The Camp of the Saints
https://en.wikipedia.org/wiki/The_Camp_of_the_Saints
The Camp of the Saints (Le Camp des Saints) is a 1973 French apocalyptic novel by Jean Raspail. The novel depicts a hypothetical setting whereby Third World mass immigration to France and the West leads to the destruction of Western civilization. Almost forty years after publication the book returned to the bestseller list in 2011.[1] The title is a reference to the Book of Revelation(Rev 20:9).
When I did radio in the late 80s using this book to talk to the public about the coming collapse of Western civ....the public could have cared less.