The mosaic strategy seemed to work pretty well for Canada. Not saying we need to copy it, but you'd think that at the very least, our social system 'would' be compatible with that. Political correctness has given minorities no reason to blend though. Why do that when they can perpetually hold it over the head of (Whites, heteros, males, etc) as a tool of dominance? The best way to have an advantage over someone else in this culture is to prove you've been victimized by him/her. And ethnic groups seem to be holding onto that advantage tooth & nail. My family didn't even come to this country until over 100 years after the Civil War, but I'm still being held accountable to compensate for acts of slavery that nobody alive today even remembers. And even after Caucasians become the minority, I doubt that will change.
Interestingly, my wife just stumbled upon an article in the past few days, suggesting that political correctness is a relic of a Nemesis... err... Marxist plot to destroy Western society from the inside out. If you will, a "super-weapon" from a dead war that rose up and ran amok after its masters had been destroyed. Heck knows if it's accurate. Could just be another conspiracy theory, but it's a pretty convincing one even to me. I've been trying to pick apart this phenomenon for years, and this is the first time I've heard mention of an attempt to 'program' people to be on the lookout for excuses to be offended.
Accurate or not, our society is living in an insane paradox. The greatest advantage is to be a victim, even though the very definition of 'victim' implies someone who is disadvantaged.