> What does it mean to give "equality of opportunity" to a black child in America, who's ancestors were enslaved, who's great grandparent was lynched, who's grandparents couldn't vote, who's parents couldn't go to university because of discrimination?

Much of this applies almost equally to Slav kids in America (when you account for what their origin countries were like) yet they seem to do pretty well compared to Blacks. So I think there's reason to be skeptical about your claim that "we've offered plenty enough to the Black community and it hasn't helped, so equality of opportunity itself must be the problem". We haven't done nearly enough for true equal opportunity to be achieved, and this goes equally for both mainstream society as a whole and the Black community itself which has often pushed in counterproductive directions.