A horizontal bar chart displays the 2010 population estimates for twenty countries, sourced from a CSV file. Built with React and D3 v5, it uses `scaleBand` for the categorical country axis and `scaleLinear` for the population axis, rendering green SVG rectangles with tooltips formatted in billions. The chart includes styled axes, a loading state, and a population label, with the D3 `csv` loader fetching and preprocessing the data.