This example displays a map of the United States on an orange background, rendered as a single green SVG path. It fetches world country boundaries from a TopoJSON file via `d3.json`, filters the data to the United States, and projects it using `d3.geoAlbersUsa` with `d3.geoPath`. The visualization uses D3 v5 and TopoJSON’s `feature` method to convert the TopoJSON topology into GeoJSON features for rendering.