This stylized bar chart displays the population of the top 10 United Nations member states in 2019, using data from a CSV file with 2020 population estimates. The React application uses D3 v6's `scaleBand` and `scaleLinear` to map countries and population values, rendering horizontal bars as SVG rectangles. The code imports `csv` from D3 to fetch the data, applies a custom tick format that converts population values from scientific notation to billions, and includes interactive tooltips via SVG `<title>` elements.