Why is shanghai most populated?

Shanghai is the most populated city in the world primarily due to its status as a global financial hub and economic powerhouse, attracting people from across China and internationally for job opportunities. Its extensive infrastructure, including a robust transportation network and modern amenities, supports a large population. Additionally, historical migration patterns and the city's rapid urbanization have contributed to its population growth. The combination of these factors has made Shanghai a magnet for both domestic and international migrants.