It doesn't matter what YOU call yourself. And, again, I'm reporting what a recognized scholar wrote--Ardy Sixkiller Clarke, PhD., Professor Emeritus at Montana State University and former Director of the Center for Bilingual/Multicultural Education there.
Dr. Clarke did NOT say, "This is the term *I* use." She said it's the term a group of scholars of that ethnicity agreed upon.
Regarding "Native Person" -- native to WHERE? If you are in Ireland people will realize you don't mean Irish? If you are in Canada people will realize you are NOT saying "I was born in Canada"? ( ... like Ted Cruz ...) (but I digress ...)
They needed a term that would be clearly understood by the academic community NO MATTER WHERE the reader was located.
When I write about the physics of how the universe started to how it got to where it is today, I use the terms "SCIENTIFIC cosmology" or "ASTRO-Cosmology", to distinguish it from MYTHOLOGICAL cosmology in religions and "origin of our people" stories.
"Scientific" and "Astro" are MY terms--NOBODY in the SCIENTIFIC community uses them. But then again, Astronomers/[Scientific] Cosmologists don't normally talk about religion and vice versa.
In things like my discussion above, I need to use terminology accepted by academics, or I need to provide an explanation for a term like "Euro-Slavic", which *I* made up.
I added a comment explaining why I said "American Indian/Native American" rather than just one, and that using the term "American Indian" is NOT considered racist, etc., among academics with such ethnicity and WHY they chose that term.