One race was not created from another. In the Bible, it tells us, that men tried to build a tower into heaven. Obviously, they were doing a pretty good job of it. That was when God seperated man from each other, and gave them different tonges (i.e. spanish, german, italian, etc.) and also gave them different skin colors.
Just goes to show, how much can be accomplished..or come very close to it, if people work together.