[Why] The political and military center of unified empire lay in the arid north, but the economic lifeline had wholly shifted to the prosperous Jiangnan. The empire had to break the mountainous obstacles and achieve grand north-south waterway connectivity. [What] Emperor Yang of Sui conscripted millions of soldiers and civilians and, centered on Luoyang, dug the south-north Sui-Tang Grand Canal spanning over two thousand kilometers and linking five major river systems. It successfully realized high-speed transport of grain and troops from Jiangnan to the capital. [Who] Emperor Yang of Sui spared no expense of national strength in pushing this engineering project, demonstrating extraordinary strategic vision and ruthlessly cold mobilization will. Countless conscripted canal workers who poured their blood upon the dikes created this miracle. [How] The Grand Canal objectively tied the political center of Huaxia to its economic center, maintaining the unified pattern for the next thousand years. It became the greatest miracle epic of the East Asian water-transport logistics network.
Why
The historic event of Opening the Grand Canal represents a key developmental peak of the Huaxia dynastic system. A colossal engineering artery that sustained empires for a millennium. By establishing this moral or administrative benchmark, it continues to shape the structural and philosophical fabric of ancient Chinese statecraft.