This bar chart visualizes the 2020 population estimates for 30 countries, sorted by country name along the vertical axis. It uses React with D3 v5’s `scaleBand` and `scaleLinear` to position bars, with SVG rectangles rendered via the `Marks` component. Horizontal axis labels apply D3’s `format` with a custom `.2s` tick formatter to abbreviate large numbers (e.g., “B” for billions). Data is loaded asynchronously from a CSV via `d3.csv` and multiplied by 1000 for actual population values.