This example displays the top 10 most populous countries as a horizontal bar chart with custom axes, using React for component state and rendering. It loads data from the United Nations World Population Prospects 2019 CSV via `d3.csv`. Scales are created with `d3.scaleBand` and `d3.scaleLinear`, while axes ticks are manually generated using `xScale.ticks()` and rendered as SVG lines and text. The chart updates asynchronously, showing a loading message until data arrives.