This bar chart displays the 20 most populous U.S. states or territories, ranked horizontally by their population counts from the 2000 census. The visualization uses React to render SVG elements, with D3 v5’s `scaleBand` and `scaleLinear` handling the axes and bar positioning. Data is loaded asynchronously via `d3.csv` from a GitHub Gist, with tooltips showing formatted population values using `d3.format`. The chart includes styled grid lines, axis labels, and a Poppins font for a clean, readable presentation.