In a dot distribution map, dots are the primary indicator of what is being measured. This map specifically is showing Farm Density Across the United States in 1997. Using the dot distribution map it becomes easy to read because you can easily distinguish areas with high farm density being a darker purple color because of a surplus of dots, and areas with low farm density being a whiter color because of a lack of dots. Here you can see the areas in the Midwest, Northeast and Southeast show a higher farm density than the areas in between the Midwest and the more Western States like California, Washington, and Oregon.
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