A choropleth map of Chicago crime incidents, colored by primary type, is rendered as red dots over a geographic projection of the United States using D3 v5's geoAlbersUsa projection and geoPath. Points are scaled to 0.02 radius initially, then animated via transition to a larger scale, with tooltips appearing on mouseover. The visualization loads state boundaries from the US Atlas TopoJSON and reads incident coordinates from a CSV file, with zoom interaction enabled.