Suppose the Great Wall of China is a series of fortifications made of stone, brick, tamped earth, wood, and other materials. It stretches over 13,000 miles from east to west across northern China and was originally built to protect the Chinese states and empires from invasions and raids. The Great Wall is a UNESCO World Heritage Site and a popular tourist destination.
Can we infer that "The Great Wall of China was built in the Middle Ages."? Yes, no, or maybe?