Of black children born to families in the top half of the income distribution, 60 percent fell into the bottom half as working age adults, compared with 36 percent of similarly situated whites.

Mazumder concluded that if future generations of white and black Americans continued to experience the same rates of intergenerational mobility, “we should expect to see that blacks on average would not make any relative progress.” He noted that this recent time period stood “in direct contrast to other epochs in which blacks have made steady progress reducing racial differentials.”

One optimistic note is that the white reaction to events in Ferguson, including the commentary of some outspoken white conservatives, has been sympathetic to the anger and outrage over the police shooting of an unarmed black teenager. This stands in sharp distinction to the aftermath of the violence in Los Angeles in 1965.

Watts – and the string of urban riots in African-American neighborhoods from 1964 to 1968 — was crucial to the expansion of the conservative coalition that dominated most federal elections from 1966 to 2004. Fear of violence helped elect Ronald Reagan governor of California in 1966 and Richard Nixon to the presidency in 1968. Law and order, white backlash, the silent majority, and racial integration became core political preoccupations for once loyal Democratic whites as they converted to the Republican Party.

Just two years after the Democratic landslide of 1964, in the 1966 midterm election, Republicans picked up 47 seats in the House. “How long are we going to abdicate law and order favor of a soft social theory that the man who heaves a brick through your window or tosses a firebomb into your car is simply the misunderstood and underprivileged product of a broken home?” Gerald Ford, then the House minority leader, asked, with the answer assumed by the question.

Nearly half a century later, however, conservatives have voiced ambivalent responses to the Ferguson rioting. On Aug. 15, Erick Erickson, a popular conservative blogger at Red State, wrote a widely circulated posting titled “Must We Have a Dead White Kid?”

“Given what happened in Ferguson, the community had every right to be angry,” Erickson wrote. “The police bungled their handling of the matter, became very defensive and behaved more like a paramilitary unit than a police force. Property damage and violence by the citizenry cannot be excused, but is also the result of a community seeing those who are supposed to protect and serve instead suiting up and playing soldier.”