Don't worry -- Shabbos Bush will annihilate our military for Israel, then Mexico will sweep up through the southwest. If we're lucky, Canada will slam down on our heads from the north, preserving at least something resembling a european-descended culture. Some of us may be lucky enough and determined enough to abandon the continent entirely to the Third World. The rest will be eating cat meat and pissing in newspaper vending boxes within a generation.
Europe watches the Aztlan "civilization" slide back from a Technological age, through the Industrial age and finally back into a pre-Industrial society. Then we raze the cities, purge the ruralities, annihilate everything that resists and resettle. Five generations, perhaps, but maybe the next time we'll get it right and teach our descendants the indisputably vital importance of hating the right people.