This interactive map of the United States uses a blue-to-white color scale to display a “University Diversity Index” for each state, with darker blue indicating higher diversity. Built with D3 v4 and React, the visualization employs `d3.geoAlbersUsa` for the map projection and `d3.geoPath` to render state boundaries. Hovering over a state triggers a tooltip that displays a histogram image for that state, with the map data sourced from an external JSON file.