This example displays a choropleth-style map of the United States with state boundaries and graticules, rendered as SVG via React components. It uses D3 v5’s `geoAlbers` projection and `geoPath` to draw land and interior borders, while loading TopoJSON data from the US Atlas. The map applies a purple land fill on a black sphere, with white interior strokes, styled through CSS classes. Data loading occurs asynchronously via `json()` and is processed with topojson’s `feature` and `mesh` functions.