A univariate choropleth map displays a single set of data via coloring or unique shading . This particular univarite choropleth map shows wer poverty exists in the United States.
>Source: http://www.cdc.gov/pcd/issues/2007/oct/images/07_0091_02.gif
>Source: http://www.cdc.gov/pcd/issues/2007/oct/images/07_0091_02.gif
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