This is a thematic map. Thematic maps show highly simplified land masses in order to focus on specific subjects, such as crime rates, pollution levels, populations, or in this map's case, types of soil in the U.S. Thematic maps rely on colors or symbols and a legend matching the colors/symbols to specific categories. This map has 9 different categories. Despite the land being heavily simplified, the state and county borders are maintained, since it's important to provide a basis which the viewer can work from as they analyze the map.
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