Fork of D3 Course Code Along - Choropleth Map
A choropleth map of world countries colored by income group, rendered with a Natural Earth projection. The visualization loads world-atlas TopoJSON data via `d3.json`, projects it with `d3.geoPath`, and colors each country using a sequential red scheme from `d3.schemeReds` based on a categorical `d3.scaleOrdinal` scale. An interactive legend built with custom SVG `circle` and `text` elements shows the color categories. The map supports zooming via `d3.zoom` and includes hover effects that highlight countries.