This choropleth map displays world countries colored by economic category, with an interactive legend that filters the map to highlight selected regions while dimming others. The visualization uses d3.geoNaturalEarth1 and d3.geoPath to render country shapes from TopoJSON data sourced from the World Atlas, with d3.zoom enabling pan and zoom navigation. A d3.scaleOrdinal with schemeSpectral maps economic groups to colors, while legend clicks toggle the highlighted selection and adjust opacity for unselected countries.