Suppose The Great Wall of China is a series of fortifications made of stone, brick, tamped earth, wood, and other materials, generally built along an east-to-west line across the historical northern borders of China. Constructed primarily during the Ming Dynasty (1368-1644), the wall is a UNESCO World Heritage Site and a popular tourist attraction.
Can we infer that "The Great Wall of China was built to serve as a transportation route for trade."? Yes, no, or maybe?