Agriculture
Northern China has grown wheat. Wheat is grown on dry land, relying on rain for moisture. Farmers are able to depend more on themselves, leading to more of an independent mindset that permeates northern Chinese culture.
On the hand hand, Southern China has grown rice for thousands of years. Rice is grown on irrigated land, requiring the sharing of water and the building of dikes and canals that constantly require maintenance, Rice farmers must work together to develop and maintain an infrastructure upon which all depend, has led to the interdependent culture in the southern region.