This example visualizes the contiguous United States with a geographical projection, showing both country outlines and a graticule grid. It uses the `geoAlbersUsa` projection and `geoPath` from d3-geo to render the shapes, while topojson-client converts the TopoJSON data from the us-atlas package into GeoJSON features. The visualization loads state data asynchronously, displaying the map once the fetch completes, and redraws it whenever new data arrives. The code highlights a simple pattern for integrating D3 with React through a state-driven update cycle.