A choropleth map displays countries colored by economy group, with an interactive color legend that filters the map by hover or click. Clicking a legend item highlights matching countries and dims the rest, while clicking again clears the filter. The visualization uses d3.geoPath with a geoNaturalEarth1 projection for country shapes, d3.scaleOrdinal with a schemeSpectral range for coloring, and loads world data from the world-atlas package. A d3.zoom interaction supports panning and zooming the map.