(Choose 1 answer)
Immigration into the U.S. over the past century has caused the percentage of immigrants in the U.S.population to
A. fall steadily over the entire century.
B. rise steadily over the entire century
C. fall steadily until the 1970s and increase thereafter.
D. remain relatively constant over the time period.
E. rise steadily until the 1970s and fall thereafter.
12
