This interactive choropleth map displays world countries colored by economy category, with a clickable color legend that highlights or dims countries in the selected group. Pan and zoom via d3.zoom transform the map, while d3.geoNaturalEarth1 and d3.geoPath render the GeoJSON features derived from World Atlas TopoJSON data. The legend uses d3.scaleOrdinal with a spectral scheme, and hover styling changes country fill to red.