With all the problems accompanying the massive, disruptive immigration from the underdeveloped world to the industrialized world, there is one word that underlies successful integration. But it is, most unfortunately, the word that you dare not speak. Better not even think it, in fact. At politically correct soirees, don't even let it cross your mind, because some smart aleck son-of-a-gun might just mind-read. Oh, you might occasionally have lapses and think that this word actually IS at the core of things, were we permitted to speak of it; but the lapse will fade quickly because the consequences are so dire.