You can be everything if you are mixed (with white) but you cant be not white. For example if you hare half english half native american, you are native american. if you are half white american half nigerian you are black (obama) and that goes with every race etc. i guess thats because white is most recessive. intra-white you are more the eastern or southern ethnicity then the northwestern, for example half german, half russian identifies rather as russian, half dutch half sicilian identifies rather as sicilian etc.