This visualization displays the ten most populous U.S. states in 2020 on a choropleth map, with all other states shown in a neutral gray. It loads U.S. state boundaries from a TopoJSON file and population data from a CSV, then uses `d3.geoAlbersUsa` with `d3.geoPath` to render the map as SVG. A sequential color scale using `d3.interpolateYlGnBu` encodes population values, and a linear gradient legend with `d3.axisBottom` communicates the color mapping. Hovering over a state reveals its population or a note that it is not in the top ten.