how long did the great wall take to build?why did they build it?

Question

because im doing a report on it and i need thi tpye of information.

Cathy · Answer

Its total construction duration shall be over 2,000 years. They are all built to protect the people and territories south of the wall from a continued threat of invasion by the northern nomadic tribes.

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how long did the Great Wall take to build? and why did they build it?