What is the main conflict in The Poetry of Robert Frost by Robert Frost?

"The Vanishing Red" is a free verse poem about a Miller who didn't think a Native American had any right to voice any reaction to his "great big thumping shuffling mill stone" when he heard him give an exclamation of surprise on seeing it. Frost says there would be no understanding his feelings about Native Americans without going back to the beginning of a long story, but that hearing the story would keep you from thinking of the conflict in terms of who began the conflict between the races, as if the Miller must have been seriously wronged by a Native. He invites him to come and see the wheel pit and when he does, he shuts him in the trap door and returns alone giving instruction to the man with the meal-sack that he doesn't understand until he realizes what the Miller had done with the Red Man.