This example shows the top 10 most populous countries in 2019 as a horizontal bar chart. It combines React for component state and rendering with D3 v5 for data loading, scales, and axis ticks. The `csv` function fetches the population data, while `scaleBand` and `scaleLinear` position bars and map values to widths. React creates SVG rectangles for each bar, and D3’s `max` and `ticks` methods compute the scale domain and axis labels.