Contemporary anthropologists and other scientists, while recognizing the reality of biological variation between different human populations, regard the concept of a unified and distinguishable White race as a social construct with no scientific basis.

So, given this idea the fact that some people are white has no real basis in reality. So, it's almost like saying a certain group is albino (even though this is an adaptation to not having enough sun so those that survived in the northern Climates in Scandinavia and places like this changed their pigment to survive not enough sun on their skin to properly survive. Because just like with plants humans need enough sun on them to survive too because of Vitamin D from the sun. In fact I usually take a chewable vitamin D3 every day to keep my spirits up in the winter time when it can be cloudy or rainy a lot. However, where I live it is also often cloudy between 55 and 65 degrees high even from June to September a lot too. So, even during the summers here it is nice to take D3 to keep enough Vitamin D in my system to feel good.

However, the explanation of why some people have white skin on some levels doesn't make sense to me because of all the Eskimo types of people from Alaska to Canada to Greenland and stuff like this. So, how can we explain this because they also live where there isn't enough sun 6 months a year too? So, why isn't their skin white too?

It doesn't really make full sense to me why white people are white and native American type of people are Red skinned. 

So, actually then what makes White people white? Their diet? It is true that white people were often herders of Goats and sheep and Cows and when things got bad everyone died who couldn't drink Goat, Sheep or Cow milk. So, could this be a factor in why white people are white? Could Be.