Here is the question, posed in the title: Does Immigration Mean The End Of Western Civilization?
Once you get beyond the handwringing about racism and fascism, Raspail’s polemical—at times frantic—novel is really about this collective loss of soul. A culture is in the end a way of life, even an identity. When one grows to love all the particular customs and traditions of one’s culture, it can be very much like loving a person. It is something unique in the world, and it belongs to you.
And soon the territory will belong to others of an alien culture. Little of what we once knew will survive. Why it will matter less than it might have is that the generation to come are already barbarous, so will meet the invaders half way and eventually split the difference. As for Mozart and Shakespeare, where are they now anyway?