As the DUmmies are so fond of asking, "Cui bono?"
"Who benefits", from keeping blacks, or any minority, in the lower socioeconomic strata? Certainly not Republicans, who believe in a strong market economy which does better when everyone is working and producing and spending and consuming.
Democrats however, depend on the "plight" of minorities to keep them in the fold, to keep their huge bloc of votes rolling in. When people become successful and self-sustaining they naturally gravitate to the Republican Party, which wants to let them keep their hard earned gains.
It's in the Democrat Party's best interest to keep people struggling. They're minorities' worst enemy.
"Progress" my ass.