The World Systems Theory was developed by Immanuel Wallerstein in the 1970s. The theory is an approach to understand the world's history and social change in the context of the world economic system.
According to the theory, the world economic system is divided into three-tier,
peripheral areas.
Semi-peripheral
Core states
Semi periphery countries are those countries that are exploited by the core states and participate in the exploitation of peripheral states.
The statement that does not characterize semi-periphery countries is the median standard of living. Semi-periphery countries are not characterized by the median standard of living.
Background. On April 26, 1986, a sudden surge of power during a reactor systems test destroyed Unit 4 of the nuclear power station at Chernobyl, Ukraine, in the former Soviet Union
