This example displays the contiguous United States as a two-tone country map, with landmasses filled in brown and state boundaries drawn as yellow lines. It uses a React component that pulls geographic data from a US Atlas TopoJSON source, converts the topology into geographic features, and renders them with d3.geoPath using the geoAlbersUsaTerritories projection. The map is generated as an SVG, with loading state managed through React hooks and the d3.json data loader.