The correct response is: Many Americans in rural areas felt that their way of life was being threatened.
During the 1920s, the rapid growth of immigrant populations in cities led to a cultural backlash, particularly from those in rural areas who felt that their traditional values, lifestyles, and social norms were being challenged by the diverse and often unfamiliar cultural practices brought by immigrants. This resulted in a rise in nativism and a push for stricter immigration controls.