This example shows a horizontal bar chart of 2019 population data for various countries, with bar lengths proportional to each country's population and bars stacked vertically without spacing. The visualization is built using React and D3 v5, where D3’s `scaleBand` and `scaleLinear` map country names to y-coordinates and population values to bar widths within an SVG canvas. Data is loaded asynchronously from a CSV file via D3’s `csv` function, and the React component uses `useEffect` and `useState` to fetch and render the chart once the data arrives.