Why was great wall built?

The major reason is that in ancient China, the dominator thought the magnificent Great Wall could protect the Chinese people from the attack of Huns (Xiongnu, a brutal minority in ancient times) or other northren nomadic tribes

do u know who built the great wall of china

it was builded to keep from the northern invasioners

The history of the Great Wall is said to start from the Spring and Autumn Periods when seven powerful states appeared at the same time. In order to defend themselves, they all built walls and stationed troops on the borders. At that time, the total length of the wall had already reached 3,107 miles, belonging to different states.

In 221 BC, the Emperor Qin absorbed the other six states and set up the first unified kingdom in Chinese history. In order to strengthen his newly born authority and defend the Huns in the north, he ordered connecting the walls once built by the other states as well as adding some sections of his own. Thus was formed the long Qin's Great Wall which started from the east of today's Liaoning Province and ended at Lintao, Gansu Province.

i like your answer Mr Blesson (india) and it is meaningful. and i can see the number of votes you have got.
thankyou

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Great Wall is said to start from the Spring and Autumn Periods when seven powerful states appeared at the same time. In order to defend themselves