Answer:
this is the story my mom used to tell me.
our skin in white. and people even go to lengths to dye their skin an even lighter shade of white(the lighter your skin was the wealthier you were).
But as times came rolling around and segregation ended and the modern era started, people stopped caring so much about having white white skin. The natural tone was kind of yellow so people kind of used it is as a racist term.
hope this helped
The answer to this question can be quite lengthy. Do you still need it?
