This fork of the freeCodeCamp choropleth map example visualizes the percentage of adults with a bachelor’s degree or higher across U.S. counties, using a sequential yellow-green color scale. The map renders as SVG via React, with county boundaries drawn using d3.geoPath and topojson feature extraction from county, state, and nation geometries. County color values are mapped through a d3.scaleSequential with interpolateYlGn, while education data is loaded from the freeCodeCamp JSON endpoint and joined to county IDs.