三个世界
Three Worlds Theory states that during the Cold War two imperialist states formed the "first world"—the United States and the Soviet Union. The second world consisted of the other imperialist states in their spheres of influence. The third world consisted of the non-imperialist countries. Both the first and the second world exploit the third world, but the first world is the most aggressive party. The workers in the first and second world are "bought up" by imperialism, preventing socialist revolution. On the other hand, the people of the third world have not even a short-sighted interest in the prevailing circumstances, hence revolution is most likely to appear in third world countries, which again will weaken imperialism opening up for revolutions in other countries too.