This choropleth map shows Indian states colored by their living cost index, with gray indicating missing data. Built with D3 v7, it loads GeoJSON boundaries via `d3.json` and renders paths with `d3.geoPath` using a Mercator projection fitted to the SVG. State names from the GeoJSON join with a hardcoded cost-index map, and a sequential YlGnBu color scale encodes values. Hovering displays a tooltip with the state name and index.