Racism has been a very big deal over the history of our modern society. The idea that skin color was somehow related with racial inferiority was a pretty dominant concept throughout the most recent part of our history. What is rather ironic is that this idea is based on no real scientific proof. As far as research goes, skin color is only skin deep, in a matter of speaking. There is no significant genetic variation between people from different races. Skin color is merely a gene, similar to any other, like the gene for hair color or eye color.
To divide an entire society based on skin color was as silly and superficial as it can get. However, it is still a wonder how this shallow perception of humanity was able to endure for so long. The answer lies primarily in the need to control society. In a world where newly born ideas like freedom were starting to appear, there was a need to establish some sort of control over society. How could an agricultural society, such as the new American South, survive without a stable work force? The solution was the use of slaves. However, justifying the lack of rights to some people in a country were ideas of freedom were proliferating would be a challenge. To solve this, a perception of racial inferiority was introduced. Consequently, the practice of slavery and discrimination was able to set its roots in the so called "free land" of America.
It’s frustrating to think that the hierarchy of a civilization would be defined on such trivial aspects as skin color. The idea that "white is right" was just a strategy to get on the top of the pyramid and become the controllers of power. Some people became so convinced on the white man's superiority that they even began to view themselves as the saviors of humanity, and defined it as "the white man's burden". To understand how shallow that perception is, is only half of the job. What's even more outrageous is that is utterly and scientifically wrong. There is no gene related with the white skin color that indicates any type of superiority, and at the same time, there is no gene related with any other skin color that would indicate any inferiority. In fact, there isn't even a subspecies of humans. Every single modern human on earth is a homo sapiens, nothing more, nothing less.