World Countries Tree
This interactive world map displays the hierarchical structure of countries organized by continent and subregion using a node-link tree diagram rendered as SVG. The visualization uses D3.js (v5) to parse the hierarchical JSON data and generate the tree layout, with horizontal link paths connecting parent and child nodes. Each country is labeled with its full name, and the tree branches out from the root "World" node through continents and regional groupings. The layout is computed using D3's tree and hierarchy modules, with custom styling applied via CSS for the connecting paths and label text.