source: http://my.ilstu.edu/~jrcarter/Geo204/Choro/Tom/Created in 1826 by Baron Pierre Charles Dupin, choropleth maps are thematic and made to show a specific data set (typically population) using colors overlaid on-top-of geographical locations. In the example above, Hispanic population density is depicted as shades of green (dark = dense) in the different counties throughout the state.
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