Which of the following was most important in prompting the americans to support the immigration act of 1924?
a. increased migration of blacks to the north
b. a nativist belief that northern europeans were culturally superior to the waves of eastern and southern europeans who had arrived in america over the last forty years
c. a desire to abolish the quota system in the united states
d. a desire to halt immigration from latin america
e. fierce economic competition for jobs between northern europeans, on the one hand, and eastern and southern europeans, on the other