Chengdu's growth into a major megacity is driven by its unique geography, historical significance, and strategic modern development. Located on the fertile Chengdu Plain, often called the "Land of Abundance," the city has thrived for over two millennia thanks to the Dujiangyan Irrigation System, which eliminated flooding and created a stable agricultural foundation. Historically, its role as a capital for various dynasties and its status as a major hub for the silk and tea trades established it as a central administrative and commercial power. During World War II, a massive influx of refugees, academics, and businesses from eastern China brought entrepreneurial energy and expanded the city's educational and commercial landscape. In the modern era, the Chinese government’s "Go West" policy transformed Chengdu into a critical inland transportation and defense hub, attracting over 300 Fortune 500 companies and fostering massive industries in electronics, software, and aerospace. Today, this blend of deep-rooted history, a high concentration of research institutions, and its reputation as one of China's most livable cities continues to draw millions of residents and investors.