This example visualizes United Nations population data for 2020 as a horizontal bar chart using React and D3. The chart displays each country as a bar, with bar length proportional to population size. The code loads CSV data via `d3.csv`, scales the bars using `scaleLinear` for population values and `scaleBand` for country categories, and renders SVG rectangles through React components. The visualization demonstrates a straightforward integration of D3’s data-loading and scaling utilities with React’s declarative rendering model.