This example uses React and D3 to render a horizontal bar chart of the top 10 most populous countries from the United Nations World Population Prospects 2019 dataset. It shows the population values as bars with x- and y-axis tick marks and labels, generated manually using `xScale.ticks()`, `scaleBand`, and `scaleLinear`. The chart is drawn as an SVG, with loading state handled via React hooks (`useState`, `useEffect`) and data fetched asynchronously with `d3.csv`.