The World Countries Tree visualizes hierarchical tweet classification data as a horizontal dendrogram. It displays a single root node branching into categories like Direct Claim, Indirect Claim, Opinion, Quote, and Not Claim, with subcategories under Opinion. The SVG rendering uses the D3 v5 tree layout and hierarchy API to compute node positions, while linkHorizontal generates curved connector paths. Interactive zoom and pan controls are enabled through d3.zoom, and all labels use the Playfair Display font. Data loads from an external data.json file.