This example displays a map of the United States rendered with green land areas and white state boundaries against a pale-green sphere background. It uses React to manage the application state and render SVG elements, while D3’s `geoAlbers` projection, `geoPath`, and `geoGraticule` handle the map geometry. Geographic data is loaded asynchronously from a TopoJSON file via D3’s `json` method, with the TopoJSON `feature` and `mesh` APIs extracting the nation outline and state borders.