However, the notion that there was little or no concern with race, when Duel in the Sun is about, well, I quote from imdb: "Beautiful half-breed Pearl Chavez becomes the ward of her dead father's first love and finds herself torn between her sons, one good and the other bad." Race plays little or no part?
If you had watched the movie, you would know that its editorial position is clear: The bias against Pearl as a suitable wife is wrong, shown most notably through the morally-centered (and Southern!) Lillian Gish character.
I won't hold my breath for your exegesis on the Henry Fonda character in She Wore A Yellow Ribbon