This choropleth map shows countries colored by economic grouping, with a color legend that filters the map when clicked. Clicking a legend item dims unselected countries and highlights those matching the chosen category. The visualization uses d3.geoPath with d3.geoNaturalEarth1 for projection, d3.zoom for panning, and d3.scaleOrdinal with schemeSpectral for colors. Country boundaries come from the world-atlas TopoJSON dataset, with hover effects and tooltips showing country names and values.