http://www.princeton.edu/~rvdb/JAVA/election2004/purple_america_2004_small.gif
Univariate choropleth maps are those that show a single variable and only one set of data. This map shows the percentages of the population that voted Republican in the previous election. The map goes from 0% to 100% Democrat in blue or 0% to 100% Republican in red--leaving purple in the middle of the range.
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