That you are looking at people who "emigrated" to Shaker Heights also suggests a selection effect. There's really no easy answer in this case. The problem isn

That you are looking at people who "emigrated" to Shaker Heights also suggests a selection effect. There's really no easy answer in this case. The problem isn't "why are blacks and whites different" but "why do blacks and whites who have similar outcomes still produce children who have different outcomes?" Three possibilities: 1. The premise is flawed; just being in Shaker Heights doesn't suggest significant uniformity. 2. Regression to the mean. 3. Culture, etc. But that begs the question of difference once again, but re: culture rather than achievements. Unless it's all hollywood's fault.