Source - http://my.ilstu.edu/~jrcarter/Geo204/Choro/
Classed choropleth map is a map that depicts area boundaries and different data for each of the states involved with the sample. It is up to the cartographer that makes the map to decided which key he is going to used for these kinds of maps. The pattern of this map is that there are more males living within the west part of the USA, not so much from the south.
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