This choropleth map visualizes global economies by country using an ordinal color scale based on the world-atlas TopoJSON dataset. Users can click legend entries to filter the map, highlighting matching countries while dimming others, and zoom and pan through d3.zoom. The d3.geoNaturalEarth1 projection and d3.geoPath render the SVG paths, with interactivity built via d3.scaleOrdinal, d3.schemeSpectral, and event-driven re-rendering.