This choropleth map visualizes global economic data by coloring countries according to a categorical color scale. Users can click legend entries to highlight countries matching the selected category, dimming all others. Built with D3 v5, it uses `d3.geoPath` with a Natural Earth projection and `d3.scaleOrdinal` for coloring. The map loads country boundaries and economic classifications from a world-atlas TopoJSON dataset, while the interactive legend and country paths are rendered as SVG elements.