But one state crushing other ones come from Imperial Ideal build during Qin and Han period. If Qin and Han never exist, say Chu never conquered by Qin, the desire of unification may never exist.
although warring states war against each other, unification desire did not truly have philosophical foundation, only ambition of rulers. If Qin and Han unification never happen, occasional successful ruler might unify temporarily for a time, only to break-up after he death.
Chu seems to have develop culture distinctive enough, with no unification, this culture will strong enough to re-establish independence.
plus without Qin and Han unification, areas south of Yangtze might managed to develop its own native kingdoms and culture, instead of swallowed by chinese culture. Nanzhao/Dali, Fujian/minyue, Nanyue might become permanently independent to modern age