This example renders a world map using the Eckert III projection, showing country boundaries as simple white-filled polygons with black outlines on a gray background. The visualization is built with React, which manages state and fetches GeoJSON country data from a CDN-hosted world atlas. D3.js version 5 handles the map projection and drawing through the `geoNaturalEarth1` and `geoPath` APIs, while the TopoJSON client converts the raw data into geographic features. The SVG output is styled with the Poppins font and presented in a fixed 900×500 viewport.