How to register as a native american<br>Retain copies of your parents' or families' tribal records. This is the best way to find out the tribe and the connection you have to a native american tribe. You will be able to use copies of these records to prove you are a descendant of a tribe member, and possibly to prove your blood quantum.
Native American has a lot of tribe.
The text stated that they need the records as the best way to find out the tribe so I think there must be a lot of tribe because it might be difficult to find it without the records. 
( z1 have :ARG0 ( z2 ethnic-group :name ( z3 name :op "Native" :op "American" ) ) :ARG1 ( z4 tribe :quant ( z5 lot ) ) )