Part Time Indian???....

While reading this novel by Sherman Alexie I realized that there can be many different part time Indians, and by part time I mean by being native as well as another race. Like Asian and native, black and native, white and native, Hispanic and native. There's even people mixed with three different races,like me for instance I just happen to be native,Caucasian,and black. When I think about it I don't think I've ever seen a Asian mixed with native,or I might have but just didn't know it. It seems like I only can tell a native when they are full native or if I ask a person their nationality which I rarely do. It's crazy because I think everyone See's a part time Indian everyday even though you may not notice them they are still there.