This is a grayscale map of the change in US population from the 1990 to 2000 US Census.
Population change was calculated from raw population totals for 1990 and 2000 census. These were then categorized by US Census division and then averaged using all states in each division. The 9 divisions were then converted into 5 roughly equal intervals. Thus allowing for easy comprehension of the map.
The map was created in Adobe Illustrator using the previously posted population change map created using a provided shapefile. All colors were removed first then gray scale added to create the map to allow for a correct consistent shading of each interval.
Intervals are comprised of two US Census divisions which have a similar percent change (within 1 or 2 percentage points) except for the final one which has one large division. This avoids the excessive clutter of each division having its own interval.
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