This example visualizes the top 10 most populous countries as a simple bar chart, with each bar’s width proportional to its 2020 population and no axes or labels. The data comes from the United Nations World Population Prospects 2019, fetched via `d3.csv`. React manages the component state, while `scaleBand` and `scaleLinear` from D3 v5 map country names and population values to SVG rectangle positions and widths. The chart intentionally lacks chart furniture, making it a stark, minimal presentation.