Serious, respectful question.

[cyclonefence]

7. I think Tom gave you the answer

The amount of cognitive dissonance required to ignore millenniums of prior and present Native habitation of this land is staggering.
So, what to “call” us? We are the Native People to this land, We are descended from the original inhabitants. We are the Indigenous People of this country currently called “america”. This has always been our homeland, it will always be.
If you require further specificity, utilize a political designation. Tribal nations such as Cherokee, Seminole, or Lakota are equivalent to “american”.
And how do you find out a person’s tribal connection and/or preference?:
Ask.
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If it is relevant to refer to which tribe the person you're talking about comes from, use that designation. If you don't know which tribe, ask..If the tribal affiliation has nothing to do with what you are saying, then the correct appellation is "American."

My friend Kerry's parents came from Korea. People always were asking her where she was from (she answered, truthfully, "Chicago.) But when she told people her parents were Korean, there was no further reference to her origins. The questioners just wanted to know. Why it mattered remained a mystery to Kerry, and to me, too.