Also I know a latino couple that is quite brown. The wife recently gave birth to a very white, blonde haired baby. Doubting his paternity, the Dad went and got a paternity test (DNA) with the little girl. It is of course his. If this family lived in acient Sweden, the white skin which absorbs more sunlight (full of Vit D) would prove quite advantagous and probably give her an unfair advantage in offspring, thus moving the tribe (or whatever) a shade lighter. Just one example of how a random mutation gives benifit to a species.
Of course there is an alternative.
Maybe they all fell down from a really high building, (that might have gotten too close to the sea that existed above the clouds) scattered all over the earth and miraclously turned into different races with different languages. Did these master engineers also develop parachutes because that must have been a long fall??? They most likely fell on the backs of Terridactals who apparentely were everywhere back then (that's where all the oil came from). Who knows, the sky was pink so anything could have happened.