Answer :
During the Gilded Age, the US population rose from nearly 40 million in 1870 to nearly 80 million in 1900. Option C. This is further explained below.
What is Gilded Age?
Generally, The Gilded Age was a period in the history of the United States that generally lasted from the years 1870 to 1900. It was a moment of significant economic expansion.
In conclusion, The population of the United States increased from around 40 million in 1870 to almost 80 million in 1900, which occurred during the Gilded Age.
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