This visualization shows the reapportionment of US House of Representatives seats after the 2020 census, with each state’s seats represented as arcs around a central point. The code uses D3 v6 with `d3.geoPath` and an Albers USA projection to render state boundaries, while seat counts and population-per-seat values from the census data drive the arc radii. The visualization highlights maintained, added, and removed seats between 2010 and 2020, with the intermediate state showing how districts shift as populations change.