A choropleth map of the United States displays violent crime rates per 100,000 people for each state, using a yellow-to-red color gradient where darker shades indicate higher crime rates. The visualization relies on D3 v7 for SVG rendering, using `d3.geoPath` to draw state boundaries and a linear color scale to encode the 2005 FBI Uniform Crime Reporting data. Hovering over a state triggers a CSS opacity transition and reveals a floating tooltip with the specific crime value, while a gradient legend bar below the map provides the color-to-value mapping.