Whether a country is strong or not depends first on a stable central government, then on a strong military force, then on a prosperous domestic economy, and finally on the overall quality of the people and an open social atmosphere.
The martial spirit and consistent external expansion of the Qin Dynasty are rare in history, and territorial expansion is the primary national policy in the imperial system handed down from generation to generation. Strong folk customs and open foreign policy make Qin have the most powerful army and the most wise political decision. Compared with the intrigue of the six eastern countries, Qin people are simple in folk customs and always carry out the will of the monarch. Sun Tzu has a saying: Those who are Taoist are devoted to the upper (monarch) and lower (minister). From a failed and far-reaching attack to a wise and far-reaching attack, it has continuously eroded the land of the six eastern countries, weakened the enemy and strengthened itself. Later, Qin annexed Shu, which occupied the most favorable situation both economically and militarily. Sweeping Liuhe is just a leisure thing.