This interactive map visualizes world countries using the Orthographic and Mercator projections, rendered as SVG paths. Users can drag to rotate the globe and click countries to switch between projections, with the United States uniquely triggering the Mercator view. The visualization uses `d3.geoPath`, `d3.geoGraticule`, and `d3.drag` for interaction, loading country boundaries from `world-atlas` JSON and names from TSV data. Hovering highlights countries, and a zoom API adjusts the SVG group’s transform.