This example renders a choropleth-style map of the United States using SVG, displaying state boundaries and national landmasses over a graticule grid. The visualization loads US Atlas TopoJSON data via `d3.json` and processes it with `topojson.feature` and `topojson.mesh` to extract land and interior borders. React components manage state and rendering, while `d3.geoAlbers` and `d3.geoPath` project the geographic coordinates. The map uses custom styling with distinct fills for land, sphere, and interiors, and includes a graticule layer for spatial reference.