This chart shows population growth from 1950 to 2020 for ten countries, using a bar chart with two overlaid bars per country to compare historical and current values. The bars are rendered using SVG rectangles via React and D3 v6, with axes built through scaleBand and scaleLinear. Data comes from the UN Population 2019 dataset, loaded with d3.csv. Hovering reveals formatted population values through native SVG title tooltips.