This bar chart displays the populations of 20 countries in 2010. Built with React and D3.js v5, it renders scalable vector graphics (SVG) rectangles whose widths are proportional to each population value. The chart imports `scaleBand`, `scaleLinear`, `max`, and `format` from D3 to position the bars and format tick labels with a custom billion suffix. Data is loaded asynchronously from a remote CSV file using D3's `csv` function, and each country's population is calculated by multiplying the 2010 column by 1,000. The visualization includes labeled axes for both country and population.