This choropleth map visualizes world countries colored by their economic group, with an interactive color legend that filters the map to show only countries in a selected category. Clicking a legend entry dims non-matching countries to 10% opacity while highlighting the selected group, and clicking again resets the view. The visualization uses d3.geoPath with a natural Earth projection, d3.scaleOrdinal with a spectral color scheme, and loads country boundaries and metadata from the world-atlas package. A zoom interaction is also included, allowing users to pan and scale the map.