Nominal Area Choropleth Map

https://courseware.e-education.psu.edu/courses/geog482/policies.shtml

This map is an example of a nominal area choropleth map. Here, we have things that generally can't be looked at quantitatively. In this map, they take a qualitative approach to look at the number of minority groups in each state, something we could easily look at qualitatively. Here, however, in order to get the idea across, using a nominal choropleth map allows for easy interpretation.