This choropleth map visualizes global economic classifications by country, with interactive filtering through a clickable color legend that updates the displayed data. The map uses a dark-blue sphere background with semi-transparent colored regions, rendered via SVG paths generated by `d3.geoPath` with an Equal Earth projection. Users can zoom and pan using `d3.zoom`, while the legend employs `d3.scaleOrdinal` with a spectral color scheme and animated transitions. Data combines TopoJSON country boundaries from world-atlas with TSV metadata, processed through `Promise.all` and the `feature` API.