This example displays a map of Mexico rendered as a single-color choropleth, with state boundaries outlined and a graticule overlay. The visualization uses a Mercator projection via `d3.geoMercator` with the map centered on the country. The geographic data is loaded from a TopoJSON file fetched with `d3.json` and converted to GeoJSON using `topojson.feature`, with the shapes drawn by `d3.geoPath`. The implementation is built with React, managing the asynchronous data fetching through a custom hook and rendering the SVG marks as React components.