This example shows the populations of the top 20 countries in 2020 as a horizontal bar chart, with country names on the y-axis and population values on the x-axis. The chart displays green bars and includes axis labels and tick marks. The code uses React with D3 v5 APIs such as `scaleBand`, `scaleLinear`, `max`, and `format` to position and label the bars, and the data is loaded from a CSV file using `csv`. The visualization is rendered as SVG elements within a React component.