sentences:  The Han dynasty collapsed at the end of the 2nd century AD, paving the way for the Three Kingdoms era.Sun Quan, the founder of the Kingdom of Wu, spent nearly 20 years subduing the Shan Yue people, the branch of the Yue living in mountains.The first wave of immigration of the noble class arrived in the province in the early 4th century when the Western Jin dynasty collapsed and the north was torn apart by invasions by nomadic peoples from the north, as well as civil war.