In the Era 1880-1920,many Immigrants Came to the United States

In the era 1880-1920,many immigrants came to the United States.It was also in this era that:

A) Racial prejudice almost disappeared from the United States.
B) Immigrants came to be defined in racial terms.
C) Economic opportunities were available to immigrants regardless of race.
D) All peoples of European origin began to be lumped together as white people.
E) Racial prejudice grew to levels never before seen in the U.S.