This choropleth map visualizes world countries with a natural Earth projection, coloring each nation light green and highlighting it red on hover. The visualization loads geographic data from the world-atlas TopoJSON and tab-separated country names, merging them by ID before rendering. Using D3 v5’s `geoNaturalEarth1` projection and `geoPath` generator, it draws SVG paths for each country, while TopoJSON’s `feature` API converts the topology into GeoJSON. A semi-transparent black stroke outlines national borders, and a blue sphere background represents the globe. Tooltips display country names via appended `title` elements.