This example displays a horizontal bar chart of population data for ten countries, sourced from a UN population CSV loaded via `d3.csv`. The React components `AxisBottom`, `AxisLeft`, and `Marks` render the axes and bars, using `scaleBand` and `scaleLinear` from d3.v7 to compute positions and widths. The visualization introduces a y-axis left with a band scale and an x-axis bottom with a linear scale. The SVG rendering shows the largest population bar extending nearly the full chart width while smaller bars are proportionally shorter. The chart is built with a loading state that displays "Loading..." until the asynchronous data fetch completes.