This example shows a choropleth-style map of the United States, with each state filled in a uniform green color and separated by white borders. It uses the Albers USA projection via `d3.geoAlbersUsa()` and renders the map as an SVG path using `d3.geoPath`. State boundaries are loaded from the TopoJSON `us-atlas` dataset and converted to GeoJSON features with `topojson.feature`. A single `path` element draws the entire collection of states.