Qin Shi Huang Unifies China’s Border Walls Into the Great Wall
Lintao County, Gansu, China
ESTIMATED68% CONFIDENCEHistory.com[3] and the Qin dynasty's Wikipedia[2] entry date Qin Shi Huang's order to join the northern border walls into one system to around 220 BCE, without a more precise date surviving.
Around 220 BCE, China’s first emperor ordered the rival kingdoms’ old border walls linked into one defensive line, the earliest version of what became the Great Wall.
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