This choropleth map colors countries by economic classification using a categorical ordinal color scale derived from d3.scaleOrdinal and d3.schemeSpectral. The visualization renders geographic shapes with d3.geoPath and a natural Earth projection, while supporting interactive pan and zoom via d3.zoom. Data comes from the World Atlas TopoJSON and TSV files, loaded through d3.json and d3.tsv. A custom d3 color legend with circles and labels appears on the left, and hovering highlights individual countries in red.