This choropleth map visualizes global income groups using a natural Earth projection, coloring each country according to its income classification. The map is rendered with SVG paths using `d3.geoPath` and `geoNaturalEarth1`, with country data loaded from TopoJSON and TSV files via the world-atlas package. A custom color legend component displays the ordinal color scale, which uses `scaleOrdinal` with a spectral scheme. The visualization supports pan and zoom through `d3.zoom`, and hover interactions highlight individual countries.