This interactive map visualizes immigrant flows between countries, showing curved paths from origin to destination for the year 2020. Clicking a country highlights it in red and displays only the migration lines associated with that selected country. The visualization uses React hooks for state management and data fetching, with D3’s `geoNaturalEarth1` projection and `geoPath` for rendering the world map and flow lines as SVG paths. Coordinates come from a local CSV, migration data from a Gist, and country boundaries from a TopoJSON world-atlas file.