Immigration Restrictions of the 1920s Were Introduced as a Result

Immigration restrictions of the 1920s were introduced as a result of

A) increased migration of blacks to the North.
B) the nativist belief that northern Europeans were superior to Southern and Eastern Europeans.
C) a desire to rid the country of the quota system.
D) the desire to halt immigration from Latin America.
E) the rampant spread of infectious diseases from southern and eastern European immigrants to native-born Americans across all of America.