In 1926, Hiram Wesley Evans, a Texan, published an article in the North American Review describing the national organization he led. He wrote, "We are a movement of the plain people. . . . and we expect to win, a return of power into the hands of the everyday, not highly cultured, not overly intellectualized, but entirely unspoiled and not de-Americanized, average citizen of the old stock." Evans's words exemplified which influential cultural strain of the 1920s?