This example shows a simple interactive map of the United States, with each state rendered as a light green shape that turns red on hover. It uses D3 v5’s `geoAlbersUsa` projection and `geoPath` to draw the geography, while TopoJSON’s `feature` extracts state boundaries from the us-atlas counties-10m dataset. The SVG paths are selected and appended via `selectAll` and `data`, with styling handled in CSS. The map is static apart from the hover effect, with no zoom or pan interactions.