The term 'division' refers to the separation or split between two groups or regions. In the context of US history, it specifically refers to the cultural and economic differences that existed between the urban industrial North and the agrarian rural South before the Civil War.
Related terms
Sectionalism: Sectionalism refers to loyalty and support for one's own region rather than for the whole country as a whole.
Industrialization: Industrialization is an economic process where an area shifts from primarily agricultural production to manufacturing goods in factories.
Agrarian Society: An agrarian society is one in which agriculture (farming) is the primary means of livelihood for most people.