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Before and After 1940: Change in Population Density

Component ID: #ti55017797

This interactive data visualization includes three maps. The maps illustrate the increase and decrease in population density in the United States over three decades: 1920-1930, 1930-1940, and 1940-1950.  The legends on each map represent the change in population density for counties (people per square mile). Taken together, the three population density maps illustrate the changes in geographic mobility during the featured decades.

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