A React-driven bar chart displays 2020 UN population estimates for ten countries, sourced from a CSV file. The example uses d3.csv for data loading and d3.scaleBand with d3.scaleLinear to construct the horizontal bars and axes. SVG elements are rendered declaratively through React components, with d3.arc used in a separate face component that visualizes a smiley face, demonstrating how to combine React state management with D3 scales and shape generators.