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The Great Wall developed from the disparate border fortifications and castles of individual Chinese kingdoms.
The state of Zhao completed a southern wall and a northern wall; the southern wall was built mainly as a defense against the Wei state.), the Qin state grew politically and militarily to become the strongest among the seven states, but it was frequently raided by the Donghu and Loufan, two nomadic peoples from the north.
Therefore, the Qin erected a wall that started from Lintiao, went north along the Liupan Mountains, and ended at the Huang He (Yellow River).
With the fall of the Qin dynasty after Shihuangdi’s death, however, the wall was left largely ungarrisoned and fell into disrepair.
Construction continued up to the Ming dynasty (1368–1644), when the Great Wall became the world's largest military structure.
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Built during the reign of King Hui (370–335 ), it was expanded from the dikes on the Luo River on the western border.
It started in the south near Xiangyuan Cave, east of Mount Hua, and ended at Guyang in what is now the Inner Mongolia Autonomous Region.
the state of Chu started to construct a permanent defensive system.
Known as the “Square Wall,” this fortification was situated in the northern part of the kingdom’s capital province.