Qin shihuangdi helped unify by creating a

A single Chinese empire.

Explanation:

The first emperor of China, Qin Shi Huang Di was the king of Qin, one of the many Chinese states that kept waging war with each other for several centuries (Warring States period). He managed to build a powerful army with new weapons and new techniques and defeated all its rivals, unifying all Chinese lands for the first time in 221 BCE. He imposed uniform administrative standards, a single written language. The Western name China comes from his name Qin.