Fork of Let's make a map with D3.js!
This example displays a world map using a natural Earth projection, with countries filled in light green and a blue sphere outline. It loads geographic data from the World Atlas TopoJSON collection and converts it to GeoJSON features using `topojson.feature`. The map is rendered as SVG paths generated by `d3.geoPath` with the `geoNaturalEarth1` projection, while the outer sphere boundary is drawn separately. The visualization demonstrates a minimal, static cartographic rendering with D3 v5.