The first world in history books refers to the superpowers at that time: the United States and the Soviet Union, the second world refers to developed countries in Europe and America such as Japan, Germany, Britain and France, and the third world refers to countries in Asia, Africa and Latin America that have just become independent or are waging wars of independence. The relationship between these three worlds is that the first world controls the third world by using the second world, thus achieving the goal of controlling the whole world, and the third world unites the second world against the first world, thus achieving the goal of opposing hegemonism.