This choropleth map displays global country polygons colored red, with a blue sphere background and hover highlighting. Built with D3 v5, it uses `d3.geoNaturalEarth1` for projection, `d3.geoPath` for rendering, and `d3.zoom` for pan-and-zoom interactions. Geographic data comes from the World Atlas TopoJSON and TSV files, which are merged to attach country names for tooltips.