This fork of a choropleth map colors countries by economy category, using a categorical color scheme with an interactive color legend built from circles and text. The visualization loads world country boundaries and metadata from the world-atlas package, merges them with TopoJSON processing, and projects the map with d3.geoNaturalEarth1 and d3.geoPath. It supports zooming via d3.zoom and highlights countries on hover by changing their fill to red.