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  2. Economic history of the United States - Wikipedia

    en.wikipedia.org/wiki/Economic_history_of_the...

    The high birth rate, and the availability of cheap land caused the rapid expansion of population. The average age was under 20, with children everywhere. The population grew from 5.3 million people in 1800, living on 865,000 square miles of land to 9.6 million in 1820 on 1,749,000 square miles.