This animated bubble chart compares urban population growth and mobile cellular subscriptions across the United States, Canada, and Mexico. Data points are rendered as SVG circles, with position encoding urban growth and subscription totals, while radius reflects subscriptions per 100 people. The visualization uses D3.js v7 scaling functions and axes, along with mouseover, mousemove, and mouseleave events for tooltip interaction. Data is loaded from a CSV file, and colors distinguish each country.