Choropleth Maps

http://my.ilstu.edu/~jrcarter/Geo204/Choro/

Choropleth maps uses different shadings to represent different values.  These maps are often used do display differences between the smaller fragments of a whole, like the individual states of America or counties in a state.  The shading in choropleth maps is helpful in developing trends.  For instance, in this map, the number of males per 100 females are far more in western rural states than in the states East of Texas to the coast.  Alaska and Nevada prove to be the most abundant states in terms of male population.