This visualization shows migrant deaths and missing persons on a world map, with a linked time-series histogram below. Brushing a time range in the histogram filters the map’s bubble radii, which encode total dead and missing counts per location. The map uses `d3.geoNaturalEarth1` and `d3.geoPath` to render country boundaries, graticules, and spheres from TopoJSON data, while React’s `useMemo` and `useEffect` manage efficient rendering. The histogram is built with `d3.bin`, `d3.scaleTime`, and `d3.brushX` for interactive filtering.