This example displays a horizontal bar chart of the top 10 countries by 2020 population, using React state to manage data loaded asynchronously with `d3.csv`. The visualization manually constructs axes with `d3.scaleLinear` and `d3.scaleBand`, rendering tick marks, labels, and bars as SVG elements. It leverages React hooks (`useState`, `useEffect`, `useCallback`) to trigger the data fetch and update the chart, while D3 utilities handle scaling and data parsing.