This choropleth map visualizes global economic data, coloring each country according to its economy category. Clicking a color in the legend filters the map to highlight only countries in that category, dimming all others. The map uses d3.geoPath with a natural Earth projection, while d3.scaleOrdinal and d3.schemeSpectral drive the color encoding. Data loads via topojson from the world-atlas package, with d3.tsv supplying the economic classifications.