A Choropleth map is a thematic map that measures whatever the specified unit is throughout a specified region. Choropleths come in various shapes and sizes, and depict various types of information, including statistical information such as per capita income and population density. The above map is considered a choropleth population density map, and allows for the visualization of the data that is collected from the US Census regarding the most populous regions in the U.S. through the use of various shades of red; the more saturated the red, the more saturated the area is with people.
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