http://images.google.com/imgres?imgurl=http://upload.wikimedia.org/wikipedia/commons/7/78/USA_states_population_density_map.PNG&imgrefurl=http://commons.wikimedia.org/wiki/File:USA_states_population_density_map.PNG&usg=__K4HkJVwk1v1Pm8hNkdsvdevkIAE=&h=581&w=936&sz=37&hl=en&start=17&um=1&itbs=1&tbnid=iZpDKZY2vIrhDM:&tbnh=92&tbnw=148&prev=/images%3Fq%3Dus%2Bpopulation%2Bmap%2B2000%26um%3D1%26hl%3Den%26sa%3DN%26rls%3Dcom.microsoft:*%26tbs%3Disch:1
A standardized choropleth map is an areally averaged map. Cartographers usually display information by percentages or by density per square mile, which is shown here. This is the United States Population displayed by square mile.
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