This animated scatterplot visualizes the population growth of U.S. cities by comparing 2020 and 2024 population figures on the x- and y-axes, with point size reflecting the absolute growth rate. Built with D3.js, it uses a custom scatter chart function that joins SVG circles with data, animating their entry, update, and exit via `.transition().duration()` calls. The code loads city data from a CSV file, applies linear scales, and includes an interactive tooltip that displays city specifics on mouseover.