Created by William and Mary students for Econ 449, American Economic Mobility Over Two Centuries. Source for the underlying data: Gibson, Campbell, and Kay Jung. "HISTORICAL CENSUS STATISTICS ON POPULATION TOTALS BY RACE, 1790 TO 1990, AND BY HISPANIC ORIGIN, 1970 TO 1990, FOR THE UNITED STATES, REGIONS, DIVISIONS, AND STATES." Working Paper, No. 56 (September 2002): Table 61.