This choropleth map visualizes world economies using a natural Earth projection, with each country colored by economic category through d3.scaleOrdinal and d3.schemeSpectral. Hovering highlights countries, while clicking a legend item filters the map to show only matching categories, dimming others via opacity adjustments. Built with d3.geoPath, d3.geoNaturalEarth1, and d3.zoom for panning, the data comes from TopoJSON and TSV files. The color legend uses d3 event handlers for interactive filtering.