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How did Qin rulers unite China?

Sagot :

Peacegoddess5503idn
I'm Chinese so this is easy 

Qin united china by standardising currency , unit measures , wheel length , the law , the language etc 

he also built the great wall of China which secures China from invaders/attackers 


I am like very busy now , so i couldn't write a nice and full explanation . But i hope this helps :)
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