[ekianjo]

Where does education fit in in your assumptions ? Even poor people make it up the social ladder thru education. Most of our ancesters were farmers, and most of them very poor too.

[cma]

You have things like alumni admissions preference at schools that didn't allow black people within just a couple alumni generations.

[lazyasciiart]

Or public school districts neatly drawn to separate rich white areas from poor black areas.