This example shows two maps side-by-side: a world map in a Natural Earth projection and a map of U.S. states using the Albers USA projection, with each state colored according to a numeric value from a linked CSV dataset. The visualization uses D3.js v7 with the `d3.geoNaturalEarth1()` and `d3.geoAlbersUsa()` projections, alongside `d3.geoPath` for rendering GeoJSON features. It loads world countries from `world-atlas`, U.S. states from `us-atlas`, joins state IDs to CSV values, and applies a sequential purple color scale to encode the data.