This visualization presents an orthographic choropleth map of the world, coloring each country by its population using a threshold scale with sequential blue shades. The code loads GeoJSON country boundaries and CSV population data via `d3.json` and `d3.csv`, projecting them with `d3.geoOrthographic` and rendering paths through `d3.geoPath`. Hover interactions trigger opacity transitions and stroke highlights on the SVG countries, while all elements are drawn with D3 v6 in a React environment.