This example renders a bar chart of country populations in 2021 using React and D3 v5. The visualization displays the top nine countries by population as horizontal bars, with country names on the y-axis and population counts on the x-axis. The code uses `d3.csv` to load data from a GitHub gist, `scaleBand` for the categorical y-axis, and `scaleLinear` for the numeric x-axis. Axes are drawn manually with SVG elements, and bars are rendered as `rect` shapes based on the scaled population values.