......How many generations does it take to educate a minority? ......
You can lead a horse to water but you can’t make him drink
You can lead a minority to school, but you can’t make him think
Why try. It’s easier to lower the expectation level to the lowest level. Then you do not have people that think for themselves.
Now, now ... be nice. To answer your question, in many cases it only takes ONE generation to educate a minority.
Your last statement is partially correct — you can lead a minority to school, but there’s no guarantee of HOW he/she will think. Case in point — Sotomayor.