This map shows global population data from 1950 to 2020 using a natural Earth projection with hover highlighting. It renders country boundaries from TopoJSON world atlas data, joined with country names from a TSV file using `reduce`. The visualization demonstrates interaction techniques, including zooming via `d3.zoom` and hover effects through CSS. D3’s `geoPath` and `geoNaturalEarth1` projection generate the SVG paths.