This animated scatterplot, built with D3v4, visualizes the changing relationship between income per capita, life expectancy, and population across 180 countries from 1800 to 2009. The chart uses a logarithmic x-scale for income, a linear y-scale for life expectancy, and circle radius to represent population, with colors encoding geographic region. Over a 30-second transition, the data points smoothly interpolate between yearly values, while a large year label updates in the background. After the animation completes, hovering over the year label enables interactive scrubbing, allowing viewers to explore the data at any point in time and observe how nations’ wealth and health have evolved over more than two centuries.