Skin color is a simple adaptation to latitude. But a lot of folks have the need to brand someone with an indelible stamp that marks a group of people as permanently inferior in their eyes. And, in cultures where there was little difference in appearances, such as India, the powerful created an underclass difference anyway - they created Untouchables.
That is VERY interesting, I wonder how generations of Eskimos in the arctic have such dark skin, maybe it is the tanning booths each night. Although I never saw any waiting lines or matter of fact I did not see any tanning booths during my time up on the north slope. LOL, go figure, get something else. God made them that way and man will in his "WISDOM" will try to change something a "ALL-WISE God" has degreed, to be so.