This network graph maps the hierarchical relationship between US states and their counties, visualizing an Eastern and Western regional structure. The visualization uses D3.js force-directed algorithms, specifically `d3.forceSimulation`, `d3.forceLink`, and `d3.forceManyBody`, to position nodes based on link and charge forces. Each node is rendered as a colored circle (white-filled with dark strokes) and links are black lines, with all elements drawn onto an SVG canvas. The data is hand-coded hierarchical JSON, with callback functions processing parent-child dependencies to generate the network’s node and link arrays.