The idea of the "caucasian" ie Aryan (Indo-Aryan) race comes from the (since disproven) belief that all Europeans are from the caucauses mountain region (present day Armenia and Georgia). That is why when some idiot calls me a "caucasian" I always say "do I look like a (expletive) Armenian to you?"
Under the old discredited system, all East Indians were referred to as "caucasoids", although genetics have shown this to be far from the truth.
Since moving to central Europe, the origins of people fascinates me. I am mostly interested in the origin of the Hungarian language, as it is related to Finish, far to the NW, and not in the path of migration from the East and through the Caucauses. There is little doubt that Europeans came from more then one direction, but if you are “white”, i.e. Caucasian, you may very well have origins in the east through those mountains.
It is also interesting that both Hungary, and its neighbor
Romania (Latin language), are completely surrounded by Serbic language countries. I agree that you can't lump everyone into one of the three groups, but it is a start, just as you start with the 3 primary colors. Jessie Jackson is obviously negroid. George Bush is obviously caucasian. Hu Jintao is obviously Mongoloid.