This map visualizes the costliness of states across the US, with each state’s centroid marked by a proportional circle whose size reflects its expense rank. The Albers USA projection renders the geographic backdrop, while the circles are colored to highlight distinctions. Built with D3 v7 and the TopoJSON library, it uses `d3.geoAlbersUsa()` and `d3.geoPath()` to draw the map. An interactive tooltip appears on hover, displaying details about each state.