This example demonstrates a simple horizontal bar chart of the top ten countries by 2020 population, using data loaded from a CSV file. The chart applies the margin convention, reserving space around the plot area with a 20-pixel margin on all sides. The visualization uses React state to manage the data and renders SVG rectangles, with scales defined by `d3.scaleBand` for the y-axis and `d3.scaleLinear` for the x-axis. Population values are parsed from the CSV using D3’s `csv` utility.