{"version":"1.0","type":"rich","title":"Untitled","description":"A choropleth map of US counties depicts poverty rates using a threshold color scale with a green sequential scheme. The visualization loads TopoJSON geographic data via `d3.json` and joins it with CSV values using `d3.map`. It renders county boundaries with `d3.geoPath`, overlays state borders, and includes a legend with an axis. The map also uses `d3.axisBottom` and `d3.scaleThreshold` for color classification.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/820bf9231c284b2d88507ab7dc03833b?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}