This map was taken from http://soils.usda.gov/use/thematic/images/drought_1_gen_area_map.jpg
This is a good example of a thematic map where the theme is the soil moisture of the contiguous united states. In this map the story is not about a demographic statistic or something that is bounded by man-made boundaries, but it is about what is going on under the surface that cannot be mapped generally based on boundaries. The map of the United States overlayed is just a reference.
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