My friend listed down American Indian and didn;t include his tribal heritage. He was waitlisted, and the colleges never questioned him about his race. So my questions is do they ask about Tribal affiliation/etc if you apply as a Native American? On my application, it asks for Tribal Code. But idk what to put in for that.
It depends on the school. Some schools only give preference to applicants who are registered with tribes. You can Google (I think Wikipedia has an interesting write up in how colleges treat this).
I believe the Common App has a space to report your tribal enrollment code if you select Native American as your race. Each school probably has their own policy as to how to classify applicants who report a NA heritage without reporting tribal enrollment.
The comments by KickingBear on this thread may give you some insight.
http://talk.collegeconfidential.com/college-admissions/1863121-just-found-out-im-native-american.html