This choropleth map visualizes global income groups, with each country colored according to its economic classification from the world-atlas dataset. The visualization uses a D3 v5 SVG rendering with a natural Earth projection, allowing users to pan and zoom through the interactive geoPath features. The map employs an ordinal color scale with a spectral scheme, while a custom legend (colorLegend.js) displays the categorical colors with circle markers. The data loads asynchronously from TSV and TopoJSON files via Promise.all, with country names and income group values shown as tooltips on hover.