Data in choropleth maps are standardized to show the comparison of distribution in different areas. The standardized information in this map is population by ares (square mile) in the US. The darker the shade of blue the higher the population in the image, making NY the state with the highest population.
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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