Curated OER
Etc: Movement of the Center of Population, 1790 1920
A map from 1920 of the eastern United States showing the westward progression of the centers of population from 1790 to 1920.
Curated OER
Etc: Movement of the Center of Population, 1790 1910
A map from 1921 showing "the center of population moving westward with varying degrees of rapidity, as indicated by the stars from 1790 to 1910." - Foster, 1921.