A choropleth map displays global economic classifications, with countries colored via an ordinal spectral scale from World Atlas TopoJSON and TSV data. Hovering a legend item filters the map, dimming non-matching countries to 0.1 opacity and highlighting matches, while clicking toggles the filter. Built with `d3.geoNaturalEarth1`, `d3.geoPath`, `d3.zoom`, and `d3.scaleOrdinal`, the SVG renders country paths and a custom color legend with interactive `onClick` handlers.