There was no Qin state in the former Spring and Autumn Five Hegemons, but during the Warring States period, the Qin state grew step by step. In 221 BC, the State of Qin destroyed the State of Qi and formally unified the world, and China realized the unification of the Chinese nation and established a centralized state. The unification of Qin was the inevitability of social development, but originally the Qin state had the opportunity to unify the world more than twenty years ago, but the fiasco of this war made unification postponed.
The Spring and Autumn Warring States is an era of a hundred schools of thought, and there are too many talents in this era, such as Pang Juan, Sun Zhen, Su Qin, Zhang Yi, etc., who have appeared briefly in history, but they are very brilliant. During the Western Zhou Dynasty, Zhou Tianzi still had rights, but after the Eastern Zhou Dynasty, Zhou Tianzi gradually only had a name, but no actual control ability. As a result, many major powers began to compete for the position of hegemony, and the Spring and Autumn Five Hegemons appeared. In the Warring States period, the situation changed slightly, and under the long-term struggle for hegemony, the pattern of the Seven Heroes of the Warring States was formed.
In the end, everyone knows that the Qin State won the world, and the Qin State was born in 905 BC. It was named after the Qin State because of the Qin Dynasty, and the successive monarchs of the Qin State were not too faint, but later when the State of Wei worshiped Wu Qi as a general, the State of Qin was a bit unable to beat it at that time. In 389 BC, the State of Qin was even beaten to the point of no return, and after Qin Xiangong ascended the throne, the system of imitating the State of Wei was stabilized. Qin Xiaogong ushered in the true strength of the Qin state, and he used the Shang Martingale variation to eliminate public opinion.
The Qin dynasty was assisted by sages, and the subsequent emperors hardly fainted. The only Qin Wu King, Yingdang, who had the potential to be a late monarch, died prematurely, and although the Qin state gave Shang Martin a death, his things were still used. By the time of King Zhaoxiang of Qin, the State of Qin intended to speed up the pace of annexing the Six Kingdoms. In fact, if there was no Battle of Handan, the Qin State might not need more than twenty years to unify the world.
Beginning in the 55th year of the Reign of Zhou Zhao (260 BC) and ending in the Same Year, the State of Qin defeated the State of Zhao. Together, the Qin army killed nearly 450,000 Zhao soldiers, almost exhausting Zhao Guo's army. Zhao Guo was already seriously injured at this time, after all, Wu Anjun baiqi did not eat Qin guo rice in vain. In the Battle of Changping, the State of Qin had already attacked with all its strength, and after the First World War, King Zhao of Qin planned to directly attack the Zhao state of Handan, but Bai Qi did not agree at that time. It is said that Handan is not easy to fight, and if the princes rescue it, it will arrive in one day. Moreover, the Qin army suffered nearly half of the casualties in the Battle of Changping. But King Zhaoxiang of Qin did not listen.
In October 259 BC, the Qin army led an army of 200,000 to attack Handan. Bai Qi never came out, seeing that the Zhao Kingdom was about to perish. But soon, as Bai had thought, the State of Wei and the State of Chu sent troops to Handan one after another. Zhao Guo cooperated, and the Qin army was defeated. The Wei-Chu coalition army then captured several cities in Hedong County, the State of Qin, a battle that seriously depleted the strength of the State of Qin and delayed the unification of the Six Kingdoms by the State of Qin.
By the time Qin Shi Huang ascended the throne, the State of Qin had gradually recovered the losses of that year. Moreover, in this battle to destroy the Six Kingdoms, Qin Shi Huang formulated a meticulous battle plan, and changed to the method of long-distance and close attack, one by one. If the Qin state had cultivated for a period of time after the Battle of Changping and then changed its strategy, it might not have taken more than twenty years to unify the six kingdoms. However, this is not good, after all, guidance is very important, during the time of King Zhaoxiang of Qin, he did not trust Bai Qi, but when Qin Shi Huang succeeded to the throne, there were five famous generals he trusted.
Reference: Chronicle of History