Kingsblood Royal by Sinclair Lewis

She was the Little Woman of the Ages, very pleasant and kind, helpful to the ambitions of her husband and the boys, and many of them were very bad ambitions. She made cookies for the neighborhood children and listened fondly to foolish serials on the radio; she was a good church-worker and a willing neighbor. She believed everything that her minister, her congressman and the secret anarch who invents the fashions in shoes and cosmetics told her, and it is she who has licensed and justified all the ravenous armies, all the pompous churches and courts and universities and good society, all the wars and misery since time was.

The Little Woman of the Ages spoke, and she said, "I don't know anything about anthropology and ethnology and biology and all that silly highbrow junk, and you can say what you like and quote all these long books, but I tell you there's a darky family lives right down the alley from us where they keep goats, and I know and I'm telling you that the darkies ARE inferior to us, and I'm not going to have 'em working in any store or bank or office where I have to go. I'm sure I wish 'em all the good luck in the world, as long as they stay in their places. And folks that say the colored folks are just like you and me--why should I pay any attention to ignorant talk like that--they don't really believe a word they say.