This choropleth map of world economies uses a spectral color scale to represent income groups, with a clickable color legend that filters the map by category, dimming non-selected countries. The visualization supports pan and zoom via d3.zoom, and displays country names and values as tooltips. Built with d3.v5 and the geoNaturalEarth1 projection, it renders SVG paths from TopoJSON data enriched with TSV metadata.