Perhaps we could invite Richard Spencer in for a brush up on the evolution of lighter skin color. As scientists have found the cradle of humanity to be in Africa, those with a larger amount of melanin who migrated out of that continent to more northern climes were over time selected to best survive if some of their melanin was decreased. 
With lighter skin we made our needed vitamin D more successfully in these darker regions . We so called "whites" are those who survived best in the area of the globe with LESS SUN. Those of Africa are truly the "children of the sun".