This bar chart displays the top 10 countries by projected 2020 population, with horizontal bars sorted by country name. React manages the asynchronous data loading via `useState` and `useEffect`, while D3 utilities `csv`, `scaleBand`, and `scaleLinear` handle parsing and scaling. The chart renders as SVG rectangles, with the data sourced from a UN population CSV fetched from GitHub, and shows a loading state until the data arrives.