Range Graded Proportional Circle Maps use circles, or in this case spheres, of various size to to indicate variations of data. This map uses spheres to show the number or Mexicans throughout the western United States. The largest spheres (ie: Texas and California) indicate 6 million, the smallest spheres (ie: North Dakota) indicating roughly 3000 Mexicans. (This map happens to display the actual number of Mexicans next to the dot)
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