In the late Warring States period, Qin became invincible, traditional powers like Chu and Qi no longer had the majesty of that year, yan, Han, and Wei were almost reduced to soy sauce, and Zhao lost his vitality after the Changping War. By 221 BC, Yingzheng destroyed 6 kingdoms in one fell swoop, and finally established the Qin Dynasty. In fact, before winning the government, there were 3 monarchs who had a better chance of unification than him, but unfortunately they all failed, of course, you have to read the reasons for it is really a bit touching.
Zhao was the only country in the late Warring States period that could compete with Qin. Although they were originally a branch separated from Jinli, they suddenly "stormed" after the reform of the Wuling King, and finally jumped into the ranks of powerful countries. Zhao Yong (赵雍), historically known as King Wuling of Zhao. His most outstanding performance was to reform the military, which made Zhao suddenly stronger. These are not to mention, King Wuling of Zhao is more like a generation of allies: he supported the post of Prince of Zhao, and forced Qin Liziji to be the King of Zhaoxiang. This kind of boldness is not something that ordinary people can play. However, such a big man died in the "Dune Palace Change" launched by his own son.
This tragedy of being starved to death by his son seems to be somewhat the result of King Zhao Wuling's own doing. At first, he came up with a farce of abolishing Chang Liyou: the younger son Zhao He was the heir, and later he felt that the eldest son Zhao Zhang was somewhat innocent, so when he was undecided, Zhao He and Zhao Zhanghuo fought. As a result, the Wuling King was starved to death by his son. At that time, he had made a plan to wipe out the Qin State, and if he did not produce this moth, perhaps it would not be the Qin State that would be unified. Unfortunately, history has no ifs, and his tragedy cannot be blamed on others.
King Yan Zhaowang was also a big man who approached reunification earlier than Yingzheng. In 284 BC, he sent Le Yi to lead the five armies of Yan, Qin, Zhao, Wei, and Han to attack the State of Qi. Le Yi laid down 70 cities in Qi in one go, and Qi only had Juzhou and Jimo left. At that moment, if Le Yi continued to attack, he could destroy the State of Qi in one fell swoop. If Yan occupies qi land, then it may be much easier to wrench wrists with other 6 countries. However, Le Yi felt that he wanted to buy people's hearts, and as a result, he did not attack for several years. In the end, the enemy's heart was confiscated and bought, and he consumed his own Yan Zhaowang to death. The New Yan King had a vendetta against Le Yi, and Qi then successfully used this contradiction to kill the Yan army. The good opportunity for the reunification of the Yan Kingdom was lost.
King Qi Min also had the opportunity to unify. In 301 BC, King Qi Min succeeded to the throne. The boss was amazed as soon as he struck. At that time, he sent Kuang Zhang, the god of war, to lead the qi, Wei, and Han armies to abuse Chu, and killed the opposing general Tang Ming and wei zhen princes in the Battle of Chuisha. Later, he asked the Kuang God of War to attack the Qin state, and as a result, he abused the Qin army in minutes and broke the fortified Hangu Pass. King Zhaoxiang of Qin only had the share of cutting off the land and seeking peace. However, later King Qi Min listened to Su Qin's series of faint moves, and finally he was also killed in the war. If he followed the script that abused Qin, maybe it would not be this ending, and there was even a possibility of unification.
Overall, King Qi Min, King Yan Zhao, and King Wuling of Zhao all had a better chance of unification than Yingzheng, but unfortunately they failed for various reasons, which was really a bit touching.