Amost extreme example of prejudice and racism in the united states in the 19th century was

a-immigration restrictions placed on catholics and irish immigrants
b-the abolition of slavery that occurred with passage of the thirteenth amendment
c-the removal of 16,000 native americans from their homes in the southeast to territories in the west.
d- racism against german-americans and italian-americans due to the fact that these were enemy countries in world war i