Just as a bivariate choropleth map uses colors or shading to display data on a variable, the univariate choropleth map does the same except it is for only one variable. Colors are used to distinguish the range of the variable and can include different colors or just shades of one color itself. This makes a map simple and quick to understand while focusing on a primary variable to study. The map shown here is an infant mortality map from England and Wales in the 1900s. It shows the “North-South Divide” signifying the issue at hand with just infant mortality across the area. Southern England, especially around London, did not see the problem as much as Wales to the north which saw very high rates comparatively.
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