What was the effect of the national origins act? a) western europeans were prohibited from coming to the united states. b) immigration was based on the national origins quota system. c) immigrants with valuable job skills were given preference.

The correct answer is B: Immigration was based on the national origins quota system. The National Origins Act was a United States federal law that set the amount of immigrants from certain countries that were allowed to enter the U.S. Admission to the U.S was determined by ethnic identity and national origin. It reduced the number of southern and eastern Europeans and excluded Asians  entering the country.

The effect of the National Origins Act was:::

(B) Immigration was based on the national origins quota system.