The theme depicted in this thematic map of the U.S. is population
change across time. In this case,
the change is shown in percentages by county, over a 10 year span
(1990-2000). This thematic map can
more specifically be referred to as a classed choropleth map – the shadings
represent different ranges of percentage of change. Thematic maps like these are very useful for examining a
phenomenon and its occurrence across space. We are able to see that during this time period, the population
increased the most drastically in the West, particularly in Arizona and Washington
State, as well as in Florida.
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