“Native American culture” only goes back thousands of years if you blend all of them together. At that point there isn’t much of a meaningful difference including the culture that came from the early Spanish colonies.

It’s not clear to me one tribe that wiped out a bunch of others to become powerful enough to be dominant for a hundred years is any more deserving of interest over Spain. From a rarity perspective sure, but not because they have any more right to the title of “American culture”.