This choropleth map shows the number of universities per U.S. state, using an orange sequential color scale on an Albers projection via `d3.geoAlbersUsa`. The map renders SVG paths for states loaded from a TopoJSON source (`us-atlas`), converted to GeoJSON with the `topojson@3` library. State data is embedded in the page, and hovering displays a tooltip with the state name and university count, powered by D3 v7's selection and event handling. States without data appear gray.