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During the Ming Dynasty, major rebuilding work took place. The Han, Sui, Northern and Jin Dynasties all repaired, rebuilt or expanded the Great Wall. Other dynasties in China had worked more on the wall and made it longer. The land in some parts of China is easy to cross, so Qin Shi Huang started building the Great Wall to make it more difficult for the Xiongnu to invade China.īy 212 BC, the wall went from Gansu to the coast of South Manchuria. The Xiongnu tribes in the north of China were his enemies. The First Emperor of China, Qin Shi Huang also called Shi Huangdi, started the Qin Dynasty. Walls on the periphery of the Northern states Yan, Zhao, and Qin became linked together, because all those states came under the rule of emperor Qin Shi Hong, during his rule (221–206 BC). The state of Zhao built walls during 325–299 BC, during the rule of king Wuling of Zhao. The state of Yan built walls during the rule of King Zhao of Yan (311–279 BC).

The state of Qi made a fortified wall for protection against the Southern states Ju og Lu and later from the kingdom Chu. 2 Construction and rebuilding of the Great Wall.The current wall was built during the Ming Dynasty. It was much farther north than the current wall. Not much of this wall remains as people have been stealing from it. The most famous wall was built between 226–200 BC by the first Emperor of China, Qin Shi Hong (Qin Pronounced as Chin), during the Qin Dynasty. The first was built in the 7th century BC. Nineteen walls have been built that were called the Great Wall of China. There are 7,000 watch towers, block houses for soldiers and beacons to send smoke signals. Later in the Ming Dynasty they used bricks. The earlier sections on the wall are made of compacted dirt and stone. It is about 21,196 kilometers long, 9.1 metres (30 feet) wide and 15 metres high. It is the longest structure humans have ever built. It was finished in 1878 and it was meant to protect the north of the empire of China from enemy attacks.

The wall is made of cement, rocks, bricks, and dirt.

The Great Wall of China is an ancient wall in China.