Choropleth map of the United States uses SVG paths to display all fifty states from TopoJSON data, with state boundaries rendered as black strokes. The visualization employs d3.geoPath with the geoAlbersUsaTerritories projection to convert geographic coordinates into screen positions. Hovering over any state changes its fill color from green to orange through CSS :hover rules. The React component loads the geographic topology asynchronously via d3.json and processes it with topojson.feature and topojson.mesh utilities.