All aspects of society belong to either its economic base, or the superstructure. Anything in the economic base is political in nature because it is in the economic base that class struggle happens, and exploitation takes place. It is also where the process of production takes place, and the details of how and to what ends production take place are very political (they're the whole basis of who really has political power). Then the superstructure, which is shaped by the base, reinforces and maintains the base. Any cultural, religious, and social affairs belong to this component, as well as the state itself. They reinforce and reflect the nature of the economic base.