Final answer:
The core concept of Materialist Theory according to Karl Marx is that societies are determined by economic factors and that the ruling class of a given society creates a political system that suits its needs.
Step-by-step explanation:
The core concept of Materialist Theory according to Karl Marx is that societies are determined by economic factors and that the ruling class of a given society creates a political system that suits its needs. Marx believed that history is a progression from one system to another, with revolutions occurring when the ruling class is overthrown and a new system is designed. He saw the transition from feudalism to capitalism as an example, where merchants seized power from kings. Marx also believed that the working class would eventually overthrow the wealthy capitalists and create a socialist state.