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Up Until the 20th Century, the United States Was a Youthful

Question 4

Multiple Choice

Up until the 20th century, the United States was a youthful nation. What has changed that situation?


A) The nation is now more than 200 years old.
B) A falling birthrate combined with greater longevity.
C) Immigration is mostly among people age 50 or older.
D) The birthrate is rising thanks to modern technology.

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