By the turn of the twentieth century, the population of the United States had shifted to three large racial and ethnic groups. These groups are
a) blacks, Hispanics, and whites.
b) Asians, blacks, and whites.
c) Asians, blacks, and Hispanics.
d) blacks, Indians, and whites.
e) Hispanics, Indians, and whites.
Answer: a) blacks, Hispanics, and whites.