This example shows a horizontal bar chart of the top 10 most populous countries in 2020, based on UN population data loaded from a CSV file. The visualization uses React state to manage the asynchronous data loading, with the `useEffect` hook triggering a D3 `csv` request. The chart renders SVG rectangles whose widths are scaled by population using `scaleLinear`, while country names are positioned along the y-axis with `scaleBand`. The code demonstrates integrating D3 utilities for data fetching and scaling within a React component architecture.