This choropleth map displays U.S. state-level data with interactive filtering, allowing users to select a category and see the corresponding color shading update across the map. The visualization uses D3 v5 and TopoJSON to render the geographic boundaries via `d3.geoPath`, while a color legend component updates dynamically based on the selected filter. State polygons are drawn in an SVG container, and the filtering logic re-applies a color scale to the shapes. The map loads and processes CSV data with a custom utility, and styling is defined in a separate CSS file.