This example visualizes a map of Mexico using a Mercator projection, displaying state boundaries and graticules. Built with React and D3 v6, the code fetches TopoJSON data from a gist, converts it to GeoJSON features with the `topojson` library’s `feature` function, and renders the paths using `d3.geoPath` and `d3.geoMercator`. The map is centered approximately on [-102, 24] and uses colorful strokes and fills to distinguish land, graticules, and other layers.