b. the urban population was growing at an unprecedented rate. 4. In early-nineteenth-century America, a. the annual population growth rate was much higher than in colonial days. b. the urban population was growing at an unprecedented rate. c. the birthrate was rapidly declining. d. the death rate was increasing. e. the center of population moved northward.

a. the annual population growth rate was much higher than in colonial days.

Explanation:

In early-nineteenth-century America, "the annual population growth rate was much higher than in colonial days."

The above statement is TRUE because, during this period, the population of the United States grew from 5.3 million people in 1800 to 9.6 million in 1820, and eventually by the year 1840, the population grew to 17,069,000 million people.

One of the major reasons for the population upsurge is due to Westward expansion which is influence by Louisiana purchase.

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explanation:

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