Scrolled through the timeline, battles everywhere, two major factions, financial interests, gender conflicts, old ancestors and newcomers. Popular science classroom: During the Spring and Autumn and Warring States periods, feudal states fought for dominance; Qin Shi Huang unified China by sweeping through the six directions. At the end of the Eastern Han Dynasty, warlords vied for control, and the world was unified by the Jin Sima family. During the Sixteen Kingdoms period of the Northern and Southern Dynasties, Emperor Wen of Sui Yang Jian completed unification. The Five Dynasties and Ten Kingdoms chaos, Song Taizu Zhao Kuangyin's Chenqiao Mutiny, achieved unification. The last major conflict was probably the Central Plains war, with Zhang Xueliang's 300,000-strong Northeast Army entering the pass to mediate.