Problem
1. How did the intended purpose of the Great Wall of China compare with how this barrier affected the people who lived near it in practice?
2. How did the Yuezhi/Kushans use the apparent disadvantages of ruling their empire to work in favor of economic success?
3. What factors worked against the trading cities of Petra and Palmyra in terms of establishing permanent stability?
4. What factors led to the cities of Central Asia becoming independently successful?