http://upload.wikimedia.org/wikipedia/commons/thumb/7/78/USA_states_population_density_map.PNG/800px-USA_states_population_density_map
Typically univariate choropleth maps describes one variable spread across a specific location, are, or region. It can be used to show information in cities, regions, countries, or globally. Other choropleth maps show more than one variable. This map shows one variable, being population per sq. mile in the 2000 census.
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