Choropleth maps portray quantitative data as a color showing the density, percent, average value, or quantity of a phenomenon within the boundary of a geographic area. Bivariate choropleth maps display two different variables both of which are displayed on one map by including two different sets of graphic symbols or colors. In this particular map you see the increase from the divorce rate in 1980 to the divorce rate in 1990. This map is also an example of cartographic animation.
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