This choropleth map displays global economic classifications by country using color-coded regions. Users can filter the map by clicking legend categories, which dims non-matching countries and highlights those with the selected value. The visualization uses d3.geoPath with a geoNaturalEarth1 projection to render SVG map paths, while d3.scaleOrdinal and schemeSpectral assign colors. Data is loaded from world-atlas TopoJSON and TSV files, and interactions rely on the d3.event zoom and legend click handlers.