An interactive world map rendered with SVG lets users click countries to view population, GDP, and region details from Natural Earth data loaded via TopoJSON. D3 geo projections—including Natural Earth, Orthographic, Mercator, and Albers—and a toggleable graticule are controlled through React state. The map uses `d3.geoPath` for geographic shapes and `projection.fitSize` for scaling, with React managing country selection and UI components.