The Qin dynasty ( ; ), or Ch'in dynasty, was the first dynasty of Imperial China. Named for its origin in the state of Qin, a fief of the confederal Zhou dynasty which had endured for over five centuries—until 221 BC, when it assumed an imperial prerogative following its complete conquest of its rival states, a state of affairs that lasted until its collapse in 206 BC. It was formally established after the conquests in 221 BC, when Ying Zheng, who had become king of the Qin state in 246, declared himself to be "Shi Huangdi", the first emperor.
Qin was a minor power for the early centuries of its existence. The strength of the Qin state was greatly increased by the Legalist reforms of Shang Yang in the fourth century BC, during the Warring States period. In the mid and late third century BC, the Qin state carried out a series of swift conquests, destroying the powerless Zhou dynasty and eventually conquering the other six of the Seven Warring States. Its 15 years was the shortest major dynasty in Chinese history, with only two emperors. Despite its short existence, the legacy of Qin strategies in military and administrative affairs shaped the consummate Han dynasty that followed, ultimately becoming seen as the originator of an imperial system that lasted from 221 BC—with interruption, evolution, and adaptation—through to the Xinhai Revolution in 1912.
The Qin sought to create a state unified by structured centralized political power and a large military supported by a stable economy. The central government moved to undercut aristocrats and landowners to gain direct administrative control over the peasantry, who comprised the overwhelming majority of the population and labour force. This allowed ambitious projects involving three hundred thousand peasants and convicts: projects such as connecting walls along the northern border, eventually developing into the Great Wall of China, and a massive new national road system, as well as the city-sized Mausoleum of the First Qin Emperor guarded by the life-sized Terracotta Army.
The Qin introduced a range of reforms such as standardized currency, weights, measures and a uniform system of writing, which aimed to unify the state and promote commerce. Additionally, its military used the most recent weaponry, transportation and tactics, though the government was heavy-handed and bureaucratic. Han Confucians portrayed the legalistic Qin dynasty as a monolithic tyranny, notably citing a purge known as the burning of books and burying of scholars although some modern scholars dispute the veracity of these accounts. Qin created a system of administering people and land that greatly increased the power of the government to transform environment, and it has been argued that the subsequent impact of this system on East Asia's environments makes the rise of Qin an important event in China's environmental history.
When the first emperor died in 210 BC, two of his advisors placed an heir on the throne in an attempt to influence and control the administration of the dynasty. These advisors squabbled among themselves, resulting in both of their deaths and that of the second Qin Emperor. Popular revolt broke out and the weakened empire soon fell to a Chu general, Xiang Yu, who was proclaimed Hegemon-King of Western Chu, and Liu Bang, who founded the Han dynasty.
History
Origins and early development
According to the Records of the Grand Historian, in the 9th century BC, Feizi, a supposed descendant of the ancient political advisor Gao Yao, was granted rule over the settlement of Qin (秦邑) in present-day Qingshui County of Shaanxi. During the rule of King Xiao of Zhou, the eighth king of the Zhou dynasty, this area became known as the state of Qin. In 897 BC, under the Gonghe Regency, the area became a dependency allotted for the purpose of raising and breeding horses. One of Feizi's descendants, Duke Zhuang, became favoured by King Ping of Zhou, the 13th king in that line. As a reward, Zhuang's son, Duke Xiang, was sent eastward as the leader of a war expedition, during which he formally established the Qin.
The state of Qin first began a military expedition into central China in 672 BC, though it did not engage in any serious incursions due to the threat from neighbouring tribesmen. By the dawn of the fourth century BC, however, the neighbouring tribes had all been either subdued or conquered, and the stage was set for the rise of Qin expansionism.