This choropleth map shows global economic classifications, with countries colored by category. Clicking a legend entry filters the map, dimming non-matching countries and highlighting the selected one while zooming and panning remain available. The visualization uses d3.geoNaturalEarth1 projection, d3.geoPath for rendering, and d3.zoom for interaction. Data comes from the World Atlas TopoJSON and TSV files, with a d3.scaleOrdinal and schemeSpectral colormap driving the legend and fills.