Answer: He has come to associate the east with the ugliness of human nature and moral corruption.
Explanation:
This question is referring to a novel by Fitzgerald ''The Great Gatsby'' and Nick Carraway is the narrator that moves trough all places in the novel.
He is comparing both East and Midwest in the novel as the opposite ones because the East is considering a lack of human values, moral emptiness and it looked all grotesque to him.
He didn't like the fast life as in the East so he decided to return to the Midwest.
