New estimates reveal U.S. states' personal income from 1880-1910.
The article estimates the total personal income for each U.S. state in 1880, 1890, 1900, and 1910. They updated the figures originally estimated by Richard Easterlin. The estimation method follows Easterlin's approach. The comparison of the original and updated figures for 1880 and 1900 is presented, along with the new estimates for 1890 and 1910.