How do you register as a Native or American Indian?
One has to be able to prove their native bloodline with an approved paper trail, and apply to their respective tribe (assuming the rolls are open to new members). Recently, some DNA research companies have offered tests to document native ancestors. You can start by contacting the tribe you wish to join and find their citizenship requirements. Be prepared to research your geneology back to 1900 or so and link it together with birth/death certificates, censuses, social security records, afadavits, etc.