Europeans have already allowed too many muslims into Europe and their demoraphic clock is counting down to the time almost all of Europe will be dominated by muslims.
Mark Steyn has written two books that lay out the demographics and shows why the die has already been cast for much of the western world.
(copies of both available on ABE Books and eBay for under $4 each)
AMERICA ALONE: The End of the World As We Know It
The future, as Steyn shows, belongs to the fecund and the confident. And the Islamists are both, while the West is looking ever more like the ruins of a civilization. But America can survive, prosper, and defend its freedom only if it continues to believe in itself, in the sturdier virtues of self-reliance (not government), in the centrality of family, and in the conviction that our country really is the world's last best hope. Mark Steyn's America Alone is laugh-out-loud funny--but it will also change the way you look at the world.
AFTER AMERICA: Get Ready for Armageddon
Steyn argues there is still hope. "Americans face a choice: you can rediscover the animating principles of the American idea—of limited government, a self-reliant citizenry, and the opportunities to exploit your talents to the fullest—or you can join most of the rest of the western world in terminal decline. This is a battle for the American idea, and it's an epic one, but you can do anything you want to do. So do it."
Good comment, Vlad! Mark Steyn was very prophetic of what we are seeing today. It is a life or death struggle for ALL republics.