This choropleth map of the United States visualizes estimated 2020 state populations in millions, using a blue sequential color scale to encode values. Built with D3 v7 and the TopoJSON library, it projects state boundaries with an Albers USA projection through `d3.geoPath`. The map reads population data from a hardcoded JavaScript object and renders an interactive SVG where hovering over a state displays its name and population in a tooltip.