Why were movements like immigration restriction, religious fundamental

Why were movements like immigration restriction, religious fundamentalism, and the Ku Klux Klan so popular in the 1920s?

What will be an ideal response?

ANSWER
All three were related to the fear, anxiety, and uncertainty generated by rapid social change in the 1920s. Those seeking a refuge from challenges to traditional values and behaviors were attracted to movements that promised the restoration or perpetuation of the old ways. Some people found the simplification of life into a series of good and bad dichotomies an attractive alternative to dealing with the complexities of change.