The fact is that discrimination by skin tone is universal. The ruling class of virtually every society is, in fact, lighter than the rest of the population. That goes for Central Africa as much as for anywhere else. When a darker usurper seizes the seat of power, he proceeds to marry his progeny off to the lighter skinned people among his subjects or to lighter skinned spouses in neighboring realms.It happens among the elites in the subpopulations, too. The wealthier families try to insure that their spawn are mated with lighter skinned spouses. It is less among the economically developed populations where impetuous youth are able to make their own choices more readily but it does not go away because the youth still understand sub- if not wholly consciously that a lighter mate will meet with more approval from family than a darker even if the subject is never mentioned.It will not change until the government controls ALL matches and assigns spouses or casual impregnations by lottery or by some mathematical system to assure random mating or perhaps a systematic preferred result.