For no good reason. Only in America do large black populations live in relative prosperity - without the need to educate themselves, behave civilly nor even work a regular job.
White America has been mercilessly taxed to support a massive transfer of wealth from white America to black America - to little or no effect whatsoever. This wealth transfer has been unprecedented in history, the recipient population is not only ungrateful, but downright hostile to the donor population. The only observably consistent effect has been to increase the population of this seething underclass, thereby making American cities dangerous places with high rates of violent crime largely and highly disproportionately perpetrated by the black population.
Black populations in America have made American cities dangerous and unlivable - even though those populations are prosperous.
Black indigence and unemployment is a farce - when observed alongside the context of the fact that 20 million Mexicans managed to swim across a river, cross a desert, run across a 4 lane highway to get a job in a land where they do not speak the language - subsequently earning enough money to not only support themselves, but send money to family members back home in Mexico. There is simply no excuse for an American born black American who can utter his/her name in English not to have gainful employment.
Black America hates white America in general. New York City Councilman Charles Barron famously said,
"I want to go up to the closest white person and say, 'You can't understand this, it's a black thing,' and then slap him, just for my mental health,"When he said 'slap', I think he was mincing words.
I think Obama is going to rip a big rent in American society. Cities will burn.
The last time the rampaging savages burned their own neighborhoods - then afterwards, their idiot leaders came out and publicly said that they shouldn't have burned South L.A. (etc.), but they should have swarmed over to Beverly Hills (etc.).
We can expect them to do some very bad things when they do.
Very good summation.