This example displays a choropleth map of the United States, highlighting state boundaries and interior borders against a graticule grid. It shows the nation as a single landmass with a distinct fill, while state separations appear as green lines. The visualization uses the `geoAlbers` projection and `geoPath` from D3.v5, with data loaded from the us-atlas TopoJSON via `d3.json`. The rendering is done in SVG within a React component, applying CSS class styles for the land, sphere, and interiors. The graticule is drawn using `geoGraticule`, though not explicitly rendered in the final output.