This choropleth map colors countries by economic grouping using an ordinal color scale with a spectral scheme. The visualization renders geographic boundaries with d3.geoPath and a Natural Earth projection, and includes a custom color legend built with SVG circles and text. Users can pan and zoom via d3.zoom, while hovering highlights individual countries. Data comes from the World Atlas TopoJSON and TSV files, loaded asynchronously with d3.json and d3.tsv.