The nominal area choropleth map that is shown above illustrates the swing states in the persidental election of 2004. Each state is represented with a different color, which is significant for the political majority of each state shown. This type of choropleth map is typically used by people to represent nominal data in a map form. It is common for these maps to be used to display different qualitative data on a specific map. This is the main pattern of interest for the maps, they are used to display data on a map.
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