This example shows a choropleth map of the United States, with each state rendered as a green SVG path on a light blue background. It loads US state boundaries from the us-atlas TopoJSON file and uses the `d3.geoPath` projection with `d3.geoAlbersUsa` to create the map. The code relies on `d3.json` to fetch the data and the `topojson-client` library to convert TopoJSON features into GeoJSON paths for rendering.