A world choropleth built with D3 v7 and React renders population figures from a CSV of 2023 estimates onto an Equirectangular projection using `d3.geoPath` and topojson country boundaries. A sequential blue color scale encodes each nation’s population in millions, with gray for missing data. Hovering a country reveals a tooltip with its name and population value, while name aliases reconcile common CSV labels to the topojson’s official names.