A refactored bar chart displays the top 10 most populous countries from the United Nations World Population Prospects 2019 dataset. The chart shows population values as horizontal bars, with country names on the y-axis and population counts on the x-axis. React components render SVG elements, while D3 v5 provides the scales and CSV data loading. The layout uses a band scale for countries and a linear scale for population, with bottom and left axes positioned within margins.