Question: When did the ancient chinese civilization begin and end?

Disambiguated questions and answers:
context: No context provided
question: When year did the ancient chinese civilization begin?
short_answers: 2070 BC

context: No context provided
question: When year did the ancient chinese civilization end?
short_answers: 221 BC

context: The earliest known written records of the history of China date from as early as 1250 BC, from the Shang dynasty (c. 1600–1046 BC), during the king Wu Ding's reign, who was mentioned as the twenty-first Shang king by the same. Ancient historical texts such as the "Records of the Grand Historian" (c. 100 BC) and the "Bamboo Annals" (296 BC) describe a Xia dynasty (c. 2070–1600 BC) before the Shang, but no writing is known from the period, and Shang writings do not indicate the existence of the Xia. The Shang ruled in the Yellow River valley, which is commonly held to be the cradle of Chinese civilization. However, Neolithic civilizations originated at various cultural centers along both the Yellow River and Yangtze River. These Yellow River and Yangtze civilizations arose millennia before the Shang. With thousands of years of continuous history, China is one of the world's oldest civilizations, and is regarded as one of the cradles of civilization.
question: During what dynasty did the ancient chinese civilization begin?
short_answers: Xia dynasty
wikipage: History of China

context: The Zhou dynasty (1046–256 BC) supplanted the Shang, and introduced the concept of the Mandate of Heaven to justify their rule. The central Zhou government began to weaken due to external and internal pressures in the 8th century BC, and the country eventually splintered into smaller states during the Spring and Autumn period. These states became independent and warred with one another in the following Warring States period. Much of traditional Chinese culture, literature and philosophy first developed during those troubled times.
question: During what period did the ancient chinese civilization end?
short_answers: Warring States period
wikipage: History of China

Long answers:
long_answer: Ancient chinese civilization began in 2070 BC and ended in 221 BC at the time of the Xia dynasty. The end of this ancient civilization is also referred to as the Warring States period.

knowledge: content: In 221 BC, Qin Shi Huang conquered the various warring states and created for himself the title of Huangdi or "emperor" of the Qin, marking the beginning of imperial China.
wikipage: History of China Warring States period (476 – 221 BC)

content: The Xia dynasty of China (from c. 2070 to c. 1600 BC) is the first dynasty to be described in ancient historical records such as Sima Qian's Records of the Grand Historian and Bamboo Annals.[5]
wikipage: History of China Xia dynasty (2070 – 1600 BC)

content: After further political consolidation, seven prominent states remained by the end of the 5th century BC, and the years in which these few states battled each other are known as the Warring States period.
wikipage: History of China Warring States period (476 – 221 BC)
long_answer: China is one of the world's oldest civilizations. The ancient Chinese civilization began in 2070 BC with the Xia dynasty of China, the first dynasty to be described in ancient historical records. By the end of the 5th century, seven prominent states remained and these few states battled each other during the Warring States period. In 221 BC, Qin Shi Huang conquered the various warring states, marking the beginning of imperial China and the end of the ancient Chinese civilization.