Why do you think that you can exclude blacks from every wealthy, large, globally connected sector of Contemporary American society...
And then complain because the blacks come out wildly different than mainstream America, after they had to develop their own ways, because they couldn't join ours?
For hundreds of years ..
White schools = can't attend.
Boy and Girl Scouts = can't join.
The military = segregated.
The 4H club = Can't join.
Little league = Can't join.
MLB, NBA, NFL = Can't join.
Red cross and Salvation Army and the Zoo and the library = can't volunteer.
The world's fair = not only they can't attend, they were used as darwinian props, a freak show.
You name it.