This visualization presents two interactive geographic maps side by side: a world map using the Natural Earth projection and a United States map using the Albers USA projection. The world map colors countries by population (in millions) using a sequential blue interpolator, while the US map shades states by crime rate using a green interpolator. Built with D3 v7 and TopoJSON, both maps load geographic data from CDN-hosted world-atlas and us-atlas JSON files, rendering SVG paths via `d3.geoPath` with hover tooltips displaying country or state names and their corresponding values. Non-highlighted regions appear gray, indicating missing data.