I'm going to have to disagree with you partially. I mean, we all didn't start out albino or whatever, but we didn't start out necessarily black. Research suggests that we were more of the tan that you would see around the equator. Yes, a large percentage of the population did become black from moving south, but we didn't start out black.
After reviewing your comment I do understand your point but I feel you should re read the bases of my argument. I'm not classifying early Homo- Erectus or Early Homo Sapien Sapiens as pure black people , but what I'm saying is that these early primitive beings contained an abundance of Melanin cells. So how you would like to classify them whether it be tan, brown or black, All of those shades are different distributions of melanin so these people were black by Nature. Tan is a shade of brown in terms of color is it not? and in terms of genetics, someone whose skin pigment is naturally tan still contains a form of melanin cells, as do all natural species of Planet Earth.