Unabridged
Here is a comprehensive, non-partisan, neutral statement of contemporary realities in the US - a non-divisive assessment of divisions, if you will:
“In the United States, Indigenous Peoples are generally divided into 3 groups: those that belong to a state or federally recognized tribe, descendants of state or federally recognized tribes without membership or recognition from the tribe, or descendants of a tribe that has no legal recognition. There are 574 federally recognized tribes, which are commonly separated into 2 groups: those within the contiguous states (i.e., Native American, Indian) and Alaskan Native. This delineation is due to the recent timing in which Alaska was settled, and the lack of treaties established between Alaskan tribes and the United States Government. These groups are separate from other non-federally recognized Indigenous groups such as Native Hawaiians, which are of Polynesian descent."
Found here, of all places: https://wildlife.onlinelibrary.wiley.com/.../jwmg.22625