Multivariate Mapping. Adding interaction to maps via dropdown menu interaction.
The map shows each counties' attribute value, and the symbology is related to the max value of the attribute. Unfortunately this series of maps is lacking a legend, so the reader won't be able to lookup precise values. The lack of legend really hurts the effectiveness of the map, but seeing as the legend is an additional effort, it is being omitted. The data is from the 2010 U.S. Census, via the Census Bearau.