"All of which raises an obvious question: Why do blacks have a hard time leaving impoverished neighborhoods? [...] Once you grasp the staggering differences between black and white neighborhoods, it becomes much easier to explain a whole realm of phenomena. Take the achievement gap between middle-class black students and their white peers. It’s easy to look at this and jump to cultural explanations—that this is a function of black culture and not income or wealth. But, when we say middle-class black kids are more likely to live in poor neighborhoods, what we’re also saying is that they’re less likely to have s with professionals, and more likely to be exposed to violence and crime. This can have serious consequences. Youthful experimentation for a white teenager in a suburb might be smoking a joint in a friend’s attic. Youthful experimentation for a black teenager might be hanging out with gang members."