This example shows a bar chart of the top 10 countries by projected 2020 population, using a dataset loaded asynchronously from a CSV file hosted on GitHub. The visualization renders as SVG rectangles scaled with `d3.scaleLinear` and `d3.scaleBand`. React’s `useState` and `useEffect` hooks manage the data-fetching lifecycle, calling `d3.csv` to parse the data and updating state once it arrives. A loading placeholder displays until the data is ready, then the bars appear.