White people are simply a result of adaptation to their climates. Everyone started out in East Africa in Tanzania/Ethiopia by the Great Rift Valley(where the first Hominids were found).. As the Africans began to migrate North they experienced a variety of climates that weren't natural to their make up. So by natural selection each race adapted to their climates. White people are white due to the fact that Europe has a colder climate, and especially during the Ice Age they had virtually no sun light. Sun Light hits our skin and allows us to use Vitiman D in a usable form, when you're dark skinned it is harder for Sun Light to penetrate Skin, unless you're constantly being hit with rays like in Africa where it's super hot, the melanin protects the skin. In Northern Europe where there's a lack of Sun Light Africans had to adapt by losing most, or all of their melanin because if there's no Sun Light forcing it's way thru your Dark Skin, what are you protecting? You need not to block Sun Light in this case, you need to lose as much as you can, basically mutate into something else in order to recieve enough Sun Light and save your species or race. As far as features, features come from the different Diets that each race consumed in their respective regions, but that's also an adaptation. For Example, Saharan and Sub-Suharan Africans are theorized to have Wider noses/nostrils due to the fact that sand gets caught up in the nose, and wider noses, bigger nostrils, and more nose hairs = better protection and breathing in such conditions. That's basically what I know about it.