This example displays a choropleth-style map of the United States with state boundaries and graticules, rendered as SVG. The map uses a geoAlbers projection with d3.geoPath and d3.geoGraticule, while React manages the component state. Data comes from a TopoJSON file loaded via d3.json and processed with topojson.feature and topojson.mesh. The visualization shows state interiors in blue, land masses in green, and a light sphere background.