Ancient China’s main rivers ran west to east ... which were constantly battling nomadic tribes. So the emperor’s officials press-ganged an estimated million workers, mostly farmers, into ...

Ultimately, he finds contemporary significance in this piece of ancient history ... Khan but to control nomadic populations, read about how bad pollution in China has become.

The Great Wall reflects collision and exchanges between agricultural civilizations and nomadic civilizations in ancient China. It provides significant physical evidence of the far-sighted political ...