This choropleth of the contiguous United States displays the country’s landmasses in a teal fill with black state borders against a black background, and states highlight to white on hover. The map is rendered as SVG using React, with geographic paths generated by `d3.geoPath` and the `geoAlbersUsaTerritories` projection. TopoJSON’s `feature` and `mesh` functions parse the US Atlas states-10m dataset to supply land and interior boundary geometries.