This choropleth map displays global economic classifications by country, with an interactive legend that filters highlighted regions. Users can click legend items to dim non-matching countries and emphasize selected categories, while zoom and pan are enabled via d3.zoom. The visualization uses D3 v5 with d3.geoNaturalEarth1 projection, d3.geoPath for rendering SVG paths, and d3.scaleOrdinal with a spectral color scheme. Data comes from the world-atlas TopoJSON dataset, with country names and economy values loaded from TSV metadata.