This fork of the UN population margin example displays the ten most populous countries for 2020 as a horizontal bar chart. It loads CSV data from a GitHub gist using `d3.csv`, then maps each country’s population to the bar width via `scaleLinear` and the country name to vertical position using `scaleBand`. React manages the component state and renders SVG `rect` elements within a margin-translated group, with D3 v7 providing the scaling functions.