A choropleth map of the United States displays average total SAT scores by state, using a blue sequential color scale to encode score ranges from 900 to over 1300. Hovering or clicking a state reveals its numeric total. The visualization loads state boundaries from a GeoJSON file and joins them with CSV data using d3.csv, then renders paths with d3.geoPath and the geoAlbersUsa projection, while a gradient legend is built with d3.scaleLinear.