The most populous city in North America is Mexico City, the capital of Mexico. With a population exceeding 9 million within the city limits and over 21 million in the metropolitan area, it is one of the largest cities globally. Mexico City boasts a rich history, vibrant culture, and diverse communities, making it a major economic and cultural hub. The city is renowned for its historical significance, stunning architecture, and various museums. Additionally, Mexico City faces challenges such as urban congestion and pollution but continues to draw migrants and tourists alike for its dynamic atmosphere.