Suppose The Great Wall of China stretches over 13,171 miles. It was built over several dynasties starting from 7th century BC to protect the Chinese states and empires against the raids and invasions of the various nomadic groups of the Eurasian Steppe. The wall is made of stone, brick, tamped earth, wood, and other materials.
Can we infer that "The Great Wall of China was primarily built to keep the Chinese people within its borders"? Yes, no, or maybe?