making a bar chart
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This example shows a horizontal bar chart ranking the populations of nine countries, using a CSV data file as its source. The chart loads the data with `d3.csv` and renders SVG rectangles scaled by `d3.scaleLinear` for population and `d3.scaleBand` for country categories. It adds axes via `d3.axisLeft` and `d3.axisBottom`, with margins and padding configured for clear labels. The visualization demonstrates a straightforward, reusable pattern for building bar charts with D3 v5.
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