During the 1920s, how did the growth of immigrant populations in cities cause a cultural backlash in the united states? a. the economy took a downturn due to increased competition for jobs in urban areas. b. the government initiated the emergency immigration act of 1921 to remove limits on immigration. c. immigrants launched protests due to the united states’ involvement in world war i. d. many americans in rural areas felt that their way of life was being threatened.