This example visualizes countries from the World Atlas dataset using a frame-like small multiple of a world map, with map boundaries from `topojson`'s `feature` API. The code loads geospatial data via `d3.json` and renders SVG paths with `d3.geoPath`, while React manages the application state. The map is drawn with the `d3.geoPath` projection, and although a line chart path is defined using `d3.line` and `curveNatural`, that mark is not used for the map; instead, only the country features are displayed. The map uses a simple SVG layout with no interactive tooltips.