 Complete the following phrase:  The Qin dynasty also romanized as Chin was the first dynasty of Imperial China, lasting from 221 to 206 BC. Named for its heartland in Qin state modern Gansu and Shaanxi, the dynasty was founded by Qin Shi Huang, the First Emperor of Qin. 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, first ending the powerless Zhou dynasty and eventually 