This example presents a choropleth map of the United States using a yellow fill for land areas, black state boundaries, and a white sphere background. Built with React and D3 v5, it uses `d3.geoAlbers` for projection and `d3.geoPath` to render the geometry, with `topojson`’s `feature` and `mesh` functions loading US states and nation data from the `us-atlas` package. The SVG output is styled via CSS classes for land, sphere, and interiors.