This example shows a bar chart of the top 10 countries by 2020 population, rendered as SVG rectangles using React. The code loads UN population data from a CSV file via d3.csv, then uses d3.scaleBand and d3.scaleLinear to map country names and population values to screen coordinates. React state management with useEffect and useState handles the asynchronous data loading and updates the visualization when data arrives. The chart is built entirely with React components and D3 scales, demonstrating a hybrid approach where React manages the DOM and D3 handles data processing and scaling.