Han dynasty and Qin dynasty

The Han dynasty (202 BC – 9 AD, 25–220 AD) was an imperial dynasty of China established by Liu Bang, and preceded by the short-lived Qin dynasty (221–206 BC) and the interregnum known as the Chu–Han Contention (206–202 BC). It was succeeded by the Three Kingdoms period (220–280 AD) and also briefly interrupted by the Xin dynasty (9–23 AD) established by the usurping regent Wang Mang. It is thus separated into two periods—the Western Han (202 BC – 9 AD) and the Eastern Han (25–220 AD). The Han dynasty is considered a golden age in Chinese history, impacting Chinese identity in later periods. The majority ethnic group of modern China refer to themselves as the "Han people", while spoken Chinese and written Chinese are referred to respectively as the "Han language" and "Han characters".

The Qin dynasty ( CHIN) was the first imperial dynasty of China. It is named for its progenitor state of Qin, a fief of the confederal Zhou dynasty (c. 1046–256 BC). Beginning in 230 BC, the Qin under King Ying Zheng engaged in a series of wars conquering each of the rival states that had previously pledged fealty to the Zhou. This culminated in 221 BC with the successful unification of China. The Qin then assumed an imperial prerogative – with Ying Zheng declaring himself to be Qin Shi Huang, the first emperor of China, and bringing an end to the Warring States period (c. 475–221 BC). This state of affairs lasted until 206 BC, when the dynasty collapsed in the years following Qin Shi Huang's death. The Qin dynasty's 14-year existence was the shortest of any major dynasty in Chinese history, with only two emperors. However, the succeeding Han dynasty (202 BC – 220 AD) largely continued the military and administrative practices instituted by the Qin; as a result, the Qin have been credited as the originators of the Chinese imperial system that would endure in some form until the Xinhai Revolution in 1911.