It makes sense, if one race has light skin as opposed to dark, it means their ancestors migrated out of africa, going from where life was easy to where life was harder in colder climates. And why did they do that? Because it was there. They had the inate need to explore the world. Others like in africa laid around all day and ate bananas that were freely available. That might have been the easy choice at the time but years later it led to their people being conquered and enslaved by hardier people.