A choropleth map of the United States colors each state by median household income for 2022, using darker blues to indicate higher earnings. The map renders state boundaries as SVG paths generated by `d3.geoPath` from TopoJSON data in `us-atlas@3`, projected with `d3.geoAlbersUsa`. A sequential color scale, `d3.scaleSequential(d3.interpolateBlues)`, maps income values to fill colors, while hover interactions display a tooltip listing the state name and income. The income figures come from the US Census Bureau.