You missed some causes here: federal judges -> prestigious law school graduates -> prestigious undergrad graduates -> high school graduates -> parents in home -

You missed some causes here: federal judges -> prestigious law school graduates -> prestigious undergrad graduates -> high school graduates -> parents in home -> blacks and black neighborhoods far more often to be policed and jailed -> private jails allow legal slavery etc etc Also, missed - federal judges -> prestigious law school graduates -> prestigious undergrad graduates -> parents rich -> etc etc. You work backwards until you get an answer you like, it seems.