White Supremacy is the direct or indirect subjugation of all "non-white" people by white people, for the basic purpose of "pleasing" and/or serving any or all "white" persons, at all times, in all places, in all areas of activity, including Economics, Education, Entertainment, Labor, Law, Politics, Religion, Sex, and War. As such, White Supremacy is the only functional form of Racism in existence that is based on color or lack thereof.
Being that this system has existed in one form or another such a long time, the history of White Supremacy is clouded in some mystery. Some historians and theoreticians have brought forth some ideas.
The Two Cradle theory was developed by Dr. Cheikh Anta Diop and explains that the severe climate and environment of Europe and Asia caused biological and cultural changes in the original human type resulting in the loss of pigmentation biologically and the development of an individualistic, xenophobic, aggressive, nomadic culture among the white isolates, in contrast to the cooperative, xenophillic, peaceful, sedentary culture among the darker skinned people who still inhabited the more benign climatic and environmental zones.
Proponents of the Two Cradle Theory such as Dr. Leonard Jeffries and Dr. Theophile Obenga cite the harsh climates of Europe and Northern Asia for the warlike disposition of the groups that live there. They also cite deserts and barren areas as cradles for warlike people such as the Arabs, Hittites & Macedonians.
The Theory of Color Confrontation, developed by Dr. Frances Cress Welsingargues that all the terroristic, violent, and racist tendencies practiced by people classified as white are a psychological response to a profound sense of numerical inadequacy and color inferiority. The psychosis, according to the theory developed when europeans started traveling the world and learning that the majority of the lands were populated by people who had varing degrees of "color producing capacity. 
The NGE teaches that the earth was inhabited by people for trillions of years, in this time there were many wars and mistreatment between the peoples of the earth. 6000 years ago a scientist, by the name of Yacub devised a plan to extract the evil in people, manifest it in the form of a man, and give the people of the earth something they can see, touch and overcome, thus overcoming the evil that exists in everyone.