Created by William and Mary students for Econ 449, American Economic Mobility Over Two Centuries. Source for the underlying data: United States Census Bureau. (1909). A century of population growth from the first census of the United States to the twelfth, 1790-1900. Retrieved from https://www2.census.gov/library/publications/decennial/1900/century-of-growth/1790-1900-century-of-growth-part-1.pdf