Classed Choropleth maps use intervals or classes to distinguish the difference in the data that the map is trying to display. In these maps, there is usually just one kind of variable, or type of data that is going to be represented. Breaking the map down into classifications helps to more evenly and clearly break up the information presented.
http://www.ilstu.edu/~jrcarter/Geo204/Choro/map-AmFact-4eqint-orange-80pct.jpg
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