This horizontal bar chart displays the populations of 20 countries in 2010, sorted alphabetically by country name. The chart uses React and D3 v5, with scaleBand for the categorical y-axis and scaleLinear for the quantitative x-axis. Population values are formatted using D3's `format` function, converting values like "G" (giga) to "B" (billion). The data is loaded asynchronously from a CSV file via d3.csv, and bars are rendered as SVG rectangles with native tooltips.