 It became most prominent in cities with high growth rates between 1910 and 1930, as rural Protestants flocked to jobs in Detroit and Dayton in the Midwest, and Atlanta, Dallas, Memphis, and Houston in the South.Close to half of Michigan's 80,000 Klansmen lived in Detroit.Members of the KKK swore to uphold American values and Christian morality, and some Protestant ministers became involved at the local level.