This example displays the populations of 20 countries using a horizontal bar chart rendered with React and SVG. The code creates scales with `scaleBand` for countries and `scaleLinear` for population values, and defines custom `AxisBottom` and `AxisLeft` components for ticks. Bars are generated with a separate `BarChart` component, and CSV data is loaded and parsed via `d3.csv` from the UN Population 2019 dataset.