A univariate choropleth map is a ma that displays a single set of data. The univariate choropleth map below shows the percent in poverty in the United States.
http://1.bp.blogspot.com/_4ALYQ6KZ-Yw/S8yfPaLJonI/AAAAAAAAAFU/23ooUR_i1ic/s1600/2008PovertyCountiesMapfour.jpg
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