illuminateedThe differences between the North and South caused people to want what was good for their region regarless of what was best for the whole nation. This is an example of:

Class and caste system

Explanation: Social stratification is defined as the system of ranking the individual of a society in a hierarchy according to the category.The groups of people are classified according to the social class. Factors such as money and wealth is the parameter for general classification.

The ranking is usually done in class system as well as caste system. The caste system distributes the rank on the basis of high and low caste. The class system is based on the  individual or social parameters.