A choropleth map colors countries by their economy category using a spectral color scale. The map is rendered with d3.geoPath and the d3.geoNaturalEarth1 projection, with a zoom interaction via d3.zoom. A color legend built with d3.scaleOrdinal and d3.schemeSpectral appears at the bottom left. Data comes from the World Atlas TopoJSON and TSV datasets, and hovering highlights a country in red.