This example shows a world map with country boundaries colored using the categorical `schemeCategory10` palette, overlaid with a graticule grid and a thick outline. The visualization uses `d3-geo`'s `geoNaturalEarth1` projection and `geoPath` to render geographic features, while `topojson-client` converts TopoJSON data from the visionscarto world-atlas into GeoJSON. Data loads asynchronously via `fetch`, and the React-based wrapper manages state transitions from loading to rendered map.