A thematic map is a map that focuses on a particular "theme". A thematic map can focus on almost anything that the cartographer is attempting to portray, an example could be states which a certain political party has won. Often thematic maps are portrayed in color, each color representing a certain topic or value. Thematic maps can also contain dots to make its representation. This map in particular represents population change over a period of time by using a color coded key. (ie: dark red = 20.8% populated to 191%).
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