Nominal area choropleth maps are a type of thematic map used in displaying areal data and separates into categories. By use of color they are able to distinguish different pieces of information between regions. There is no specific order in which the information is to be portrayed. In this map the number of Democrats vs. the number of Republicans holding seats in the House of Representatives is shown. The areas in red are Republican and blue is Democrat. The different districts are broken up then colored in relation to the winning party. In this map the information is divided into two categories.
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