linguistic:paraphrasing, quality:correction, structural:scholar_edition, quality:corruption, structural:summarization
Growth of power

Lord Shang Yang, a Qin statesman of the Warring States period, introducing a number of militarily advantageous reforms from 361 BC until his death in 338 BC. Yang also helped construct the Qin capital, commencing in the mid-fourth century BC Xianyang. The resulting city greatly resembled the capitals of other Warring States.

Notably, Qin engaged in practical and ruthless warfare. During the Spring and Autumn period, the prevalent philosophy had dictated war as a gentleman's activity; military commanders were instructed to respect what they perceived to be Heaven's laws in battle. For example, when Duke Xiang of the rival state of Song was at war with the state of Chu during the Warring States period, he declined an opportunity to attack the enemy force, commanded by Zhu, while they were crossing a river. After allowing them to cross and marshal their forces, he was decisively defeated in the ensuing battle. When his advisors later admonished him for such excessive courtesy to the enemy, he retorted, "The sage does not crush the feeble, nor give the order for attack until the enemy have formed their ranks."

The Qin disregarded this military tradition, taking advantage of their enemy's weaknesses. A nobleman in the state of Wei accused the Qin state of being "avaricious, perverse, eager for profit, and without sincerity. It knows nothing about etiquette, proper relationships, and virtuous conduct, and if there be an opportunity for material gain, it will disregard its relatives as if they were animals." This, combined with a strong leadership from long-lived rulers, openness to employ talented men from other states, and little internal opposition gave the Qin a strong political base.

Another advantage of the Qin was that they had a large, efficient army and capable generals. They utilised the newest developments in weaponry and transportation as well, which many of their enemies lacked. These latter developments allowed greater mobility over several different terrain types which were most common in many regions of China. Thus, in both ideology and practice, the Qin were militarily superior.

Finally, the Qin Empire had a geographical advantage due to its fertility and strategic position, protected by mountains that made the state a natural stronghold. This was the heart of the Guanzhong region, as opposed to the Yangtze River drainage basin, known as Guandong. The warlike nature of the Qin in Guanzhong inspired a Han dynasty adage: "Guanzhong produces generals, while Guandong produces ministers." Its expanded agricultural output helped sustain Qin's large army with food and natural resources; the Wei River canal built in 246 BC was particularly significant in this respect.