A choropleth map of the United States displays per-state crime rates using a sequential color scale from light pink to dark red. Hovering over a state highlights its border and reveals a tooltip with the state name and crime rate. The visualization uses D3 v7 and topojson to load US Atlas GeoJSON data, projecting it with `d3.geoAlbersUsa` and rendering paths via `d3.geoPath`. Crime values are mapped to colors using `d3.scaleQuantize`, with mouse events and a tooltip div providing interaction.