Followed the order of Qin Shihuang, the Great Wall of China was constructed to keep the Xiongnu from invading from the north and the west.
It was The Xiongnu
No, it was to keep out invading armies from the north.
The huns
They were afraid that the advancing UN forces would not stop at the border but follow the fleeing North Korean forces into China, thus invading China.
It was built to protect the country from raids.
The Grand Canal was the waterway that was constructed to link China's two great rivers, the Yellow River in the north and the Yangtze in the south.
It was to protect China from the invasion of the Xiongnu people from Mongolia. The Xiongnu tribe was China's main enemy at that time. The Chinese built the Great Wall to prevent them from entering and conquering China. Originally made up of shorter walls between factions, the wall was fortified and lengthened under the emperor Qin Shi Huang beginning in 221 BC.Odyssey Cheaters;) lol
Japan was invading countries to take land and natural resources. One of the countries that Japan wanted to take land from was China. China has iron and coal in the north.
North invaded South.
The Han empire was invaded by nomadic Xiongnu tribesmen from the north and west of the Han Empire.
Yong Le did not build the Great Wall of China. Yong Le did however build the Forbidden City. The Great Wall of China was constructed by China's first emperor, Qing Shi Huang, as a protection against the barbarians in the north.
The Korean War was a proxy war between the Chinese and Americans.