This choropleth map colors countries by economic classification using a categorical ordinal color scale derived from World Atlas TopoJSON and TSV data. It renders the map with d3.geoPath and a natural Earth projection, while a custom colorLegend module displays the scale using SVG circles and text. The map supports zooming via d3.zoom, and hovering highlights individual countries by turning them red. The visualization uses SVG rendering with d3 v5.