This interactive choropleth maps the global cost of living index, encoding each country’s relative expense with a red-to-blue color gradient derived from a sequential scale. Hovering over a country displays its name, while clicking attempts to open a modal window, which is only partially implemented. The visualization uses D3’s `geoNaturalEarth1`, `geoPath`, and `geoGraticule` to render the world map, along with a custom `colorLegend` component. Data comes from a local CSV file, with geographic boundaries loaded from a TopoJSON world atlas.