 One way of thinking about China proper is to refer to ancient Han Chinese dynasties.Chinese civilization developed from a core region in the North China Plain, and expanded outwards over several millennia, conquering and assimilating surrounding peoples, or being conquered and influenced in turn.Some dynasties, such as the Han and Tang dynasties, were particularly expansionist, extending far into Central Asia, while others, such as the Jin and Song dynasties, were forced to relinquish the North China Plain itself to rivals from Northeastern and Central Asia.