Final answer:
The Ku Klux Klan of the 1920s idealized American identity as Anglo-Saxon and Protestant, and their membership grew substantially while promoting racist and nativist narratives.
Step-by-step explanation:
From the perspective of the Ku Klux Klan of the 1920s, the ideal American was Anglo-Saxon and Protestant. The Klan at that time exhibited strong racist and nativist tendencies, believing that the United States was in imminent danger of losing what they believed to be its essential character due to the influence of Jews, Catholics, and nonwhite immigrants. Membership rosters swelled to an estimated four million, including many from the middle-class. The Klan's view encompassed a disdain for African Americans, immigrants, particularly those from Southern and Eastern Europe, Latin America, and Asia, as well as a mistrust of Catholics and Jews. Overall, the Klan advocated for a white, Protestant, nativist vision of American society, where traditional values and hierarchies were fiercely preserved.