Chinese civilization first developed 5,000 years ago in North China along the middle and lower reaches of the Yellow River. And the Yellow River remained the center of Chinese civilization for the next 4,000 years. Then a thousand years ago, this changed. A thousand years ago, the center of Chinese civilization moved to the Yangtze. And the Yangtze, not the Yellow River, has remained the center of its civilization. A thousand years ago, the Chinese...