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To defend off the invasions from northern invaders, Emperor Qin Shi Huang had all the walls joined up. Thus, the Great Wall came into being. ... Most of the current Great Wall we see today was built in the Ming Dynasty (1368-1644) and is approximately 6000km long.

i hope that this was what u meant
When the Ming’s built the Great Wall the mongols didnt give up they threatened that part of china so the people of the Ming Dynasty expanded the wall i hope this helps :)
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