Answer: World-system theory
Step-by-step explanation:
World-system theory are various approach to how past events in the world played out alongside social changes and it's impact on the people.
They are many claims the rich make their wealth off the poor, many of those claims could be true, as we are surrounded with a few rich and many struggling person's in the society. These theories and many more which tell how past events play out is known to be World-system theory.