题目内容
（请给出正确答案）
[主观题]
What did the people in the United States do as the nineteenth century progressed？A．They em
What did the people in the United States do as the nineteenth century progressed？
A．They emigrated to other countries.
B．They often settled in the West.
C．They tended to change the place where they lived.
D．They had a higher birthrate than ever before.
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