White Anglo-Saxon Protestant
Many Americans in the 1920s were unhappy about the immigration from Eastern Europe. A group called White Anglo-Saxon Protestant tried to reduce the number of immigrants to the US and the Ku Klux Klan tried to get rid of people who they considered to be a threat to the USA. The latter is responsible for a switching point in the novel, as the Ku Klux Klan kills Aesop and Mother Sioux and put the house on fire.