So you're saying that the original primitive savages we pale faces evolved from are those groups of people living today in east central Africa? You do know that considering yourself superior to other groups is the essence of racism? It is. Fortunately, you're wrong.
The wide range of not-entirely-black progeny of Noah strongly indicates that Noah's family was "mixed race", and gave us the characteristics that we display. We are either one family, or competing groups that evolved differently. If you don't see the racism, good for you.
And with the brief application of science, <poof!> the Bible, not evolution, accounts for Human DNA diversity, as per the headline.

You're also wrong about coming from Africa. According to the Biblical account, we are not from Africa, but from Mount Ararat. We're all recently descended from Noah & Sons, and so you can find the genetic traits of the entire population of the earth in pretty much any sub-population because this was a relatively recent event. We're one human race because we are all family: direct family, with no "improvements" for favored races.