This choropleth displays the 50 U.S. states, each filled in green with white interior borders, and highlights states in orange on hover. It uses a geospatial projection via `geoAlbersUsaTerritories()` and renders the map with `d3.geoPath` on an SVG canvas. State boundaries come from the US Atlas TopoJSON dataset, which is loaded with `d3.json` and processed through TopoJSON’s `feature` and `mesh` functions. The React app manages data loading with `useState` and `useEffect` hooks.