This choropleth visualizes poverty rates across U.S. counties using a threshold color scale with seven shades of red. It renders county boundaries as SVG paths via `d3.geoPath` and topojson, with each county filled according to its poverty value from a CSV dataset. Interactive tooltips display the county name and poverty figure on mouseover, powered by D3 event handlers. The visualization relies on d3.v6, topojson.v2, and d3-legend.