"Native American - Any indigenous person of the western hemisphere."
So are these artifacts from Greenland, Cuba, Puerto Rico, Brazil, Australia/New Zealand, or maybe even Antarctica?  These are all places in the Western Hemisphere.

The term Native American is so generic and vague.  At least Columbus had a plausible excuse that he thought he had landed in India; however, there are only two possibilities why modern educated individuals are erroneously using this term - Arrogance or ignorance.   Arrogance is deliberately asserting that the term only applies to native people of the United States, and then the other people that are so afraid of offending someone (political correctness) have no clue what the term actually means.

Colonization of the new world blindly continues.....