A univariate choropleth map is one that only shows one variable combined with some type of areal data. In this map the result of the 2012 House of Representatives election is shown in each state. The only thing that is shown is if the Republicans (in red) or the Democrats (in Blue) won the majority. These maps are generally the simplest kind to read and interpret.
http://www.electionresources.org/us/maps/representatives.php?election=2012
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