This bar chart displays the population of 20 countries in 2010, sorted by country name and scaled in billions. Built with React and D3 v5, it renders as an SVG, using `scaleBand` for the categorical y-axis and `scaleLinear` for the quantitative x-axis. The code loads data from a CSV file via `d3.csv`, formats tick labels with `d3.format`, and implements custom `AxisBottom`, `AxisLeft`, and `Marks` components for the chart elements.