Answer: The wall completely protected China from being invaded by enemies living in the frontier lands bordering them.
Step-by-step explanation:
The Great Wall of China, which today is China’s biggest tourist attraction, was not built during a single dynasty. It is a centuries-old project that has been upgraded. It took its present form in the 15th century during the Ming Dynasty when a Mongol invasion threatened China. The function of the wall was to protect other tribes from penetrating China. The Great Wall of China is one of the most significant projects in human history. In addition to the function of protecting the country and borders, it also functioned for trade control.