This is an example of a standardized choropleth map, showing the United States. This map is displaying the population per square mile by state, according to information taken in a 2000 census. The different shades of purple represent the different amounts of people in a given area. http://upload.wikimedia.org/wikipedia/commons/thumb/7/78/USA_states_population_density_map.PNG/800px-USA_states_population_density_map.PNG
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