I read this awhile back and never finished it. My knowledge of the time period isn't great, but hey, it's fiction, I'm not really supposed to judge accuracy.
Although the story poses itself as an argument for equality between cultures, I couldn't help but be struck by the white tourist superiority complex that's so rife in these types of books. Everything about the Native American culture is such a "wonder." It's as if the writer tries so hard to avoid criticism that there's this fake enthusiasm and exoticism of another culture in a weird, fetish sort of way. And of course the white female lead wins the strong, most masculine male of the other culture. Somehow the white person always ends up with the best person from any minority culture. Of course, these issues aren't unique to this book. If anything, see my review for One Thousand White Women. That book was a million times worse. Too bad I couldn't give it negative stars.
Overall, this book was a good portrayal of the time, and a good treatment given the publication date. It just doesn't sit well with me, reading it in the 2010s.