This site has digitized one of the greatest historical atlases, Charles O. Paullin and John K. Wright’s Atlas of the Historical Geography of the United States, first published in 1932. This digital edition reproduces all of the atlas’s nearly 700 maps. Many of these maps are enhanced here in ways impossible in print, animated to show change over time or made clickable to view the underlying data.
Atlas of the Historical Geography of the United States
Resource Link: https://dsl.richmond.edu/historicalatlas/