This visualization compares population growth between Taiwan and the United States from 99 to 110 years, displaying animated bar charts that rank regions by population. The bars update dynamically each year, with the current year displayed prominently and tooltips showing exact population values on hover. The animation uses `d3.interval` to cycle through yearly data, while `d3.scaleLinear` and `d3.axisTop` handle the chart scaling and axes. The visualization also includes a separate line chart plotting population rates for Taiwan, rendered with `d3.line` and interactive circles for each data point.