Africa had civilization when most of Europe was barely out of the hunter-gatherer stage, and were trading with far off places like India and China before Europe even knew what they were.
We are not talking about Africans here, but their near feral offshoot here in America currently under the yoke of Marxist plantation wokeism. They've appropriated their ancestors sufferings as if they are theirs, and pretty much want to use it overthrow everything and put everybody under their boot and rule over them forever.
Same old revolutionary communism just wearing a different dress.
As politically incorrect as this may be, consider that only rarely were the good warriors captured in battle, and that the vast majority of captives and even tribal members sold off to itinerant slave collectors (likely Arab) were, to be gentle, not the cream of the crop.
A tribal leader (local 'king') would seek to trade off excess dead weight, incorrigible captives, and even those within his tribe who showed ambitious tendencies toward his throne, wives, livestock, etc.
Thus, for the most part, those shackled at the pier were not the best Africa had to offer, but more likely the other end of the spectrum. For the most part, these were not some random sweep through a population capturing a cross section of that group, but a collection of undesirables, ne'er do wells, and those who had failed in combat. That did not mean that there were not those who displayed intelligence, skill, or cunning, just that for the most part, these captives were the underachievers of their respective populations, and not even simply a criminal class like those who populated some colonies, but simply those who lacked merit enough to be allowed to remain in their inherent social contexts.
Their progeny, at least those who could/would work and were hardy enough to survive, are the ancestors of many of the demographic today.
There are many notable exceptions to that rule, mind you, those who were expert tradesmen, who showed intelligence that put them at the high end of that population, and who have made valuable contributions to society as a whole, and to them I apologize for painting with a broad brush, but certain cultural norms (statistically derived points from today's population) indicate that most apples have not fallen far from those eldest trees.
Back in the '60s, there was a tendency toward (as in other demographics) escaping lifelong manual labor through education and becoming professionals, but this quiet movement was undercut by the ravings of The New Left, loudly citing Marxist memes of class envy and alleged (and sometimes true enough) unfairness. While there were attempts to eliminate the latter through bringing attention to the problems, and then government programs (which often did more damage than good), envy is a seductive emotion that absolves the bearer of responsibility for their actions and situation, and places blame on and directs anger toward others (of any group, just those who are perceived to have more). Without more stringent cultural standards, violence, larceny, murder and mayhem follow.
Without the cultural desire to move forward, there will be no improvement. As long as that desire to achieve is attacked within that demographic context as being part of some hostile demographic, the prognosis is bleak.
With all that considered, I have known and currently know blacks who seek improvement, education, and excellence in what they do. Through effort and merit they have achieved supervisory positions or what we would commonly consider 'success'. We must remember, that despite the apparent distribution noted across demographics, there are those folks who are good, and those who succumb to the seduction of evil, and they come in all colors, shapes and sizes.