This example shows H1B petition case statuses as colored circles positioned on a map of the United States. An interactive legend allows hovering over a case status to dim all other statuses and highlight the selected one. The visualization uses React with D3 v5, employing `geoAlbers` and `geoPath` for map projections and `scaleOrdinal` for the color mapping. It renders SVG elements and loads geographic data from the US-Atlas TopoJSON, while petition data comes from a CSV file.