This example shows 2019 population data for ten countries as horizontal bars with SVG axes built manually. React state manages the CSV data loaded via `d3.csv`, while `scaleBand` positions countries along the y-axis and `scaleLinear` maps population values to bar widths. The code generates tick marks and labels by iterating over `xScale.ticks()` and the y-domain, drawing grid lines and text with SVG elements.