I'm with you until you point the finger at slavery. Blaming it on the "legacy of slavery" seems to me to be intellectually lazy: first, it is vague to the point of uselessness. Second, it ignores all of the things which have happened since the end of slavery, some of which happened as the part of the aftermath of slavery, but some of which happened for completely independent reasons. It also ignores the fact that slavery ended at very different times, under very different circumstances, in different parts of the country, but those differences largely aren't reflected in test scores or other measures of social or economic success. If we're going to solve the problem, we need to identify the real, proximate causes so that they can be addressed.
I don't have any stats handy, but I've read several times that after the civil war, blacks saw steady improvement in their economic status, on similar (albeit slower) trend to various immigrant ethnicities who faced initial integration troubles, but that this progress stopped and then reversed in the '70s. This reversal correlated very strongly to the rise of out of wedlock births among blacks. I've read that, if you correct for single-parent/dual-parent families, the difference in school performance between all ethnic groups almost completely disappears, even if you don't correct for things like income level or the education level of parents (although those two things also correlate with single/dual-parent status, so correcting for it tends to correct for them to some degree). Did slavery cause marriage and stable families to decline among blacks over a century after the 13th amendment? It seems to me that, just as our society was finally putting "the legacy of slavery" to rest, something else happened to hurt the black community even worse. If we can figure out what it was, we'll be well on our way to closing the gap. Unfortunately, so much damage has been done at this point that I don't think that simply removing the original cause will fix the problem--extra measures will be needed to repair the damage.
I would categorize this as more of a catalyst than a cause. Once the breakdown of family norms begins, this would accelerate the process by putting more young black men into prison, turning some of them into absentee fathers, thus normalizing single motherhood. However, strong family structures tend to discourage illegal or risky behaviors like drug dealing or drug use, leading me to believe that something else must have happened to weaken them before large numbers of black men would end up in prison for drug offenses. Furthermore, I doubt if there is much overlap between the set of "guys who would deal illegal drugs for a living" and the set of "guys who would settle down with the girls they impregnated and be good fathers, if only they weren't in prison." In other words, the increase in drug dealing/use (which facilitated increased incarceration due to draconian drug laws) and the increase in single motherhood were not cause and effect, but rather effects of the same root cause.
The problem with the Rockefeller drug laws and subsequent enforcement was the unequal application - despite the fact that whites and blacks use and deal drugs at roughly the same rates, blacks are more likely to be arrested and jailed for drug crimes and given longer sentences.
You talk about "norms" but as was pointed out in another HN thread (http://news.ycombinator.com/item?id=2031655) drug use is essentially a "norm" in the USA. The problem is that only certain segments of the population get punished for it, which leads to not finishing school, not being able to get a job, etc. It certainly is a cause.
Wish I could up vote this a hundred times. I also wonder what happened in the 70s. A big cultural change in 'white' America that was copied/amplified in 'Black' America? I can't put my finger on it either, but there really is something concrete about 'family values' that expresses itself for generations.
"I can't put my finger on it either, but there really is something concrete about 'family values' that expresses itself for generations."
I wasn't around at the time, but I think that the social movements of the '60s and '70s threw the baby out with the bathwater. There were definite wrongs that needed to be fixed (segregation being the prime example), but in the process of fixing them we inadvertently damaged key aspects of our societal structure. I think that this happened because of the way our culture lumps together completely unrelated positions into strongly correlated groupings that we label "conservative" and "liberal." As a modern example, consider the fact that people's positions on gun control, abortion, and taxes all tend to correlate very strongly in our country, even though all three are orthogonal (libertarians being an example of people who buck this trend to some degree). In the '60s and '70s, bad things like racism got lumped in with many of the good things we collectively label as "family values," to the point where many of the people fighting against the bad stuff saw the good parts as being part and parcel.
This carries over today: my most liberal friends consider "family values" to be an ugly euphemism for "racism," "homophobia," and "misogyny." They don't make any distinction for the good parts like "get married before you have kids," and "marriage is a serious and important commitment which requires a lifetime of compromise and sacrifice." They think that the bad parts are inherent aspects of the culture, which implies that the only way to get rid of them is to radically change the entire culture. I've even read positions more extreme than those of my friends: people who think the parts I label good, like the institution of marriage, to be part of the problem.
I don't have any stats handy, but I've read several times that after the civil war, blacks saw steady improvement in their economic status, on similar (albeit slower) trend to various immigrant ethnicities who faced initial integration troubles, but that this progress stopped and then reversed in the '70s. This reversal correlated very strongly to the rise of out of wedlock births among blacks. I've read that, if you correct for single-parent/dual-parent families, the difference in school performance between all ethnic groups almost completely disappears, even if you don't correct for things like income level or the education level of parents (although those two things also correlate with single/dual-parent status, so correcting for it tends to correct for them to some degree). Did slavery cause marriage and stable families to decline among blacks over a century after the 13th amendment? It seems to me that, just as our society was finally putting "the legacy of slavery" to rest, something else happened to hurt the black community even worse. If we can figure out what it was, we'll be well on our way to closing the gap. Unfortunately, so much damage has been done at this point that I don't think that simply removing the original cause will fix the problem--extra measures will be needed to repair the damage.