I personally believe that racism comes not from skin color but from religious and cultural differences. That difference then is associated with the common skin color of the peoples practicing those cultures and religions.
It's really too bad that we humans are still ignorant in this digital age. We have the capability to communicate with anyone around the world. We still get provoked into childrens quarrels and fights with just a single word and never look towards the big picture which is "what can we do for us, humankind."
Until we accept each other as brothers and sisters and stop dividing ourselves we will never achieve unity. Hell my people the Hmong people is a perfect example of racism.
Hmong people - Wikipedia, the free encyclopedia
According to history in China B.C. the Hmong people were subject to a defeat in which the Hmong were divided and cast out into the borders of China in all directions. We have never recovered since then and fight to this very day about our differences instead of uniting under being Hmong.
The information can be found in the book "Tragic Mountains" by Jane Hamilton-Merril "Chapter 1"
Tragic Mountains: The Hmong, the Americans, and the Secret Wars for laos, 1942-1992
Author: Jane Hamilton-Merril
Copyright 1993 Indiana University Press