This choropleth map visualizes the world's countries, colored according to their economic classification. The map uses D3's `geoNaturalEarth1` projection and `geoPath` to render the geographic shapes, with an ordinal color scale based on a spectral scheme to represent the data. Country data comes from the world-atlas dataset, which merges TopoJSON geometry with TSV metadata. Interactive features include zooming via `zoom()` and a color legend built with `scaleOrdinal` and SVG elements. Hovering over a country highlights it in red and displays a tooltip with its name and economic group.