This visualization presents two choropleth-style map examples: a world map using the Natural Earth projection and a United States map using the Albers USA projection, both rendered as SVG with D3 v7 and TopoJSON. The world map displays countries from the `world-atlas@2` dataset with a graticule overlay, while the US map shows states from `us-atlas@3`. The code uses `d3.geoNaturalEarth1`, `d3.geoAlbersUsa`, `d3.geoPath`, and `topojson.feature` to project and draw geographic features from remote TopoJSON files.