This visualization displays population trends for global regions from 1950 to 2100, using animated line charts that color-code each region via a categorical scale. The data, sourced from UN population estimates, is processed through a custom melt function and rendered as SVG with D3 v5, React, and the `d3.axisBottom`, `d3.axisLeft`, and `d3.line` APIs. A color legend with animated transitions clarifies the mapping, while styled tick lines and labels enhance readability.