This example displays a map of the United States rendered as grey SVG paths with dark strokes. The visualization uses D3 v4’s `d3.geoPath` and the `d3.geoAlbersUsa` projection to draw country boundaries from TopoJSON data loaded via `d3.json` and parsed with `topojson.feature`. The map is centered within an SVG container using a fixed translate transform, with styling applied through CSS and inline attributes.