https://www.e-education.psu.edu/geog486/node/1849
The main purpose of a Bivariate chrolopleth map is to display two variables on a single map by combining two different sets of graphic symbols or colors. The bivariate colored rectangle legend in the top right displays how many colors are possibly on the map. This bivariate choropleth map exhibits the 2008 presidential election between Barack Obama and John McCain by county. A perfect blend of blue and red is purple, which covers most of the map, telling you it was a close election.
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