Study the history of First World countries. They were very hierarchical class ridden societies where the masses lived in abject poverty and the Royalty and Nobility had absolute power over their subjects. For example let us look at the Victorian era.The slums in Victorian England were absolute cesspools of filth, crime and disease. And these people were not black. They were blue eyed
blonde children who would be wallowing in the filth and dirt in these slums. And they were considered part of "the lower orders" not to be spoken of except with disgust and abhorrence by high society.
And yet slowly but surely they pulled themselves up by their bootstraps to be what they are today. With the passage of time there was a linear correlation towards wealth and prosperity.
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The opposite seems to happen in Africa.