Just one question for Gyou'un - why Zhao lost there pieces of lands when previous or current 3GH were present in battlefield !? Lol
Because Zhao was fighting multiple states at the time which means Qin could invade and take land if the opportunity strikes. Let's say Renpa and Rinshoujou are dealing with the Fire Dragons, while Chousha is fighting Yan. Chances are whatever generals stationed at the Qin border would get wrecked by Ouki and he'd take a few cities.
States lose and gain land all the time. Iirc Wei took back Sanyou and took a decent amount of land during Gyou.
Even Kouyoku successfuly invaded some of Southern Qin after Kanki died
And Zhao also was nerfed by losing a lot of men because of the king's stupidity.
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Historically Qin may have been the dominating force of that era by a gigantic margin, but it's a different story in the manga
King Sho Qin was definitely the strongest, but the gap wasn't as big as it was in Kingdom as it was historically.
I mean look at how much bigger and powerful Chu is compared to Qin. Historically
, at this point Qin was the largest state in both population and size iirc.