Chinese history can be defined as a period of time of multiple emperors, dynasties, and philosophies. After each dynasty, China never seemed to be stabilized or “unified.” The Qin Dynasty was one of the main dynasties that had the greatest impact on its unification. The Qin had a greater impact because the Qin Dynasty was the first unified, multinational, and power centralized “state.” The Qin strongly unified China by having a political, economic, and social impact. The Qin Dynasty unified China politically by ending the Warring States Era, economically by standardizing currency and language, and socially by using harsh tactics to strengthen the empire and centralize the people.The Qin Politically unified China by putting the Warring States Era to an End. The Era of Warring States was a period in Chinese history from 475 to 221 BCE where as many as seven dynasties were at war, all which were trying to unify China under its control. The Qin controlled one of the northwestern states during the Era of Warring States of the late Zhou dynasty. They were militarily advanced and used their own innovative technologies to defeat their opponents in battle. They eventually won out over the other states and the Zhou leadership, and the Qin leader, Shi Huangdi made himself emperor. He was the first in the long line of Chinese emperors. The Qin Dynasty arose and brought China out of it by defeating the last of its rivals and beginning the Qin dynasty in 221 BC. The Qin Dynasty economically impacted China by standardizing currency; this was another effort to unify China. By standardinzing currency, it had led to greater commerce in the whole region, thus better economy. Shi Huangdi made the ban liang coin the single currency of the new Qin Empire. Emperor Qin unified the other six kingdoms by replacing the different national currencies and using the Qin ban liang. The Qin ban liang is a round coin with a square hole in the middle and 1.2 inches in diameter. There were other forms of bronze money in different sizes and shapes, but when the ban liang coin came, those forms were no longer used. This standardisation of currency was seen as a symbol of the emperor’s political authority across the whole region and key into development of the Qin’s economy. The unification of this currency was used for house/land taxes, food/water, and everything else people wanted or needed. This currency was important for the economic unification of China because it solved the complicated issues that the heavy and inconvenient knife currency and Bu currency caused, and so that is why that the Qin Ban Liang currency was an important milestone in the history of Chinese currency, and also the coinage was easily circulated within the empire.