This visualization uses a refactored React and D3 v5 approach to display the top 10 most populous countries as horizontal bars, with the United Nations World Population Prospects 2019 data loaded via the `d3.csv` API. It shows a clean, axis-labeled bar chart generated through modular components: `AxisBottom` and `AxisLeft` create tick marks and labels using `scaleLinear` and `scaleBand`, while `Marks` renders each rectangle bar based on population values. The SVG output is rendered directly by React, with axes and bars drawn using explicit coordinate transformations.