This example renders a choropleth-style map of the United States using React and D3 v5. It displays land areas as red paths, state borders as green strokes, and a blue circle mark, all projected with the Albers equal-area projection (_geoAlbers_). The map loads TopoJSON data from the us-atlas states-10m.json dataset via _d3.json_, then converts it to GeoJSON features using the _topojson.feature_ and _topojson.mesh_ functions. The SVG output is generated through _d3.geoPath_ within a React component.