This interactive map visualization displays world countries and U.S. states using a selectable orthographic or Mercator projection. Users can drag to rotate the globe and click on countries to switch between projections, with a special case for the United States. Built with D3 v6 and d3-geo-projection, it renders geographic features via d3.geoPath, uses topojson for data parsing, and incorporates d3.drag and d3.zoom for interaction. The visualization loads world and U.S. atlas TopoJSON data from unpkg, with animations applied via D3 transitions.