That's ten more years than LBJ said he'd have their votes. Turned out it worked...for them, sorta.
(Not counting the incredible damage it has done to their culture, the nation , education, the economy, et cetera.)
They’ve been destroyed by it; successful blacks are the exception, not the norm. The true horror of what has been wrought is masked by government employment, social promotion in education, and affirmative action hiring that accommodates “dead wood” for the sake of “diversity”. The mask is falling off because in a global economy there is little use for semi-literate college grads of any color.