African Nations with Largest White Populations

No, they are not

This whole black/white thing is really just a relic from the American segregation era and ultimately slavery. Only then and there, the contrast between very dark-skinned and very light-skinned people became so obvious and such a socially important feature. If you travel from, say, Central to Southern Europe, then along the eastern Mediterranean, through Israel, Egypt, Sudan, Ethiopia, Kenya and further south or west, you will see a slow and steady gradient of skin tones becoming darker. There is no clear line, and ethnicities are far more diverse and go much deeper than just skin colour. A person from Somalia is probably much more closely related to someone from Iceland or Japan than from Ghana.