This example displays the ten most populous countries as horizontally oriented bars without axes or labels, using a simple SVG bar chart. It loads United Nations World Population Prospects 2019 data via `d3.csv`, then sorts the first ten rows by population. React state management with `useState` and `useEffect` handles the asynchronous data loading, while D3’s `scaleBand` and `scaleLinear` map countries and population values to screen coordinates. The bars are rendered as SVG `<rect>` elements, with each bar’s width proportional to its country’s 2020 population estimate.