http://jaymans.wordpress.com/2012/09/08/further-testing-the-pioneer-hypothesis-canada-and-russia/
Choropleth maps are types of thematic maps that show a shaded or patterned region in order to express data such as proportion. This map showing US population density helps visualize the level of variability within the US and expresses valuable information for people that would like to move from one place to another and government planning.
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