This interactive visualization displays all US counties as a choropleth-style map rendered with a natural Earth projection using d3.geoPath. The map is drawn with SVG elements, featuring graticules and a sphere outline to provide geographic context. County boundaries come from a TopoJSON file loaded asynchronously and converted to GeoJSON features. Built with React and D3 v7, the visualization dynamically fills the browser window and uses the Poppins font for its minimal interface.