This animated visualization displays the top five most populous U.S. cities in 2023, with circles scaled by the square root of each city's population and labeled with the city name and exact population figure. The chart uses a dark radial-gradient background and color-coded radial gradients for each circle. Built with D3.js version 7.8.5, the code leverages the `select`, `transition`, and `easeLinear` APIs to manage the animated entrance of elements, delaying the growth of each circle and the fading in of its labels. The underlying data comes from a Wikipedia list of U.S. cities by population.