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 as early as the 7th century BC, the wall is one of the most extensive military structures in the world, stretching over 13,000 miles (21,196 km) and including various branches and spurs.
Can we infer that "The Great Wall of China was built in the 18th century."? Yes, no, or maybe?