The Law Library of Congress recently introduced the Indigenous Law Portal. The portal includes an interactive map of American Indian Constitutions and Legal Materials. Clicking on a state brings up the online indigenous law materials available for that state, including constitutions, codes, and links to tribal websites. New York, for instance, includes materials from the Cayuga, Oneida, Onondaga, Saint Regis Mohawk, Tonawanda Seneca, Tuscarora, Seneca, and Shinnecock Nations.
You can access the interactive map here.