This USA country map visualizes the fifty states and their internal borders using the geoAlbersUsaTerritories projection from the `geo-albers-usa-territories` package, with geographic data loaded from the `us-atlas` TopoJSON source. The React-based app fetches the topology via `useEffect` and `d3.json`, then passes land features and interior state boundaries as props to a marks component. Rendering uses `d3.geoPath` to convert GeoJSON into SVG paths, with land areas filled teal and state boundaries stroked in black, while a CSS hover effect highlights individual states. The visualization is built with D3 v5, React 16, and TopoJSON.