http://my.ilstu.edu/~jrcarter/Geo204/Choro/Tom/
Choropleth maps are best for showing ranges of nominal data in predetermined units of area. For example, in this map, we can see precentages(nominal) of Hispanic people in each county(areal unit). I believe the downside to this map is that it can be misconstrued into non-congruent areal units.
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