Second World in the context of "Cold War"

The term Third World arose during the Cold War to define countries that remained non-aligned with either NATO or the Warsaw Pact. The United States, Canada, Japan, South Korea, the Southern Cone, Western European countries and other allies represented the "First World", while the Soviet Union, China, Cuba, North Korea, Vietnam, and their allies represented the "Second World". This terminology provided a way of broadly categorizing the nations of the Earth into three groups based on political divisions. Due to the complex history of evolving meanings and contexts, there is no clear or agreed-upon definition of the Third World. Strictly speaking, "Third World" was a political, rather than economic, grouping.

Since most Third World countries were economically poor and non-industrialized, it became a stereotype to refer to developing countries as "third-world." In political discourse, the term Third World was often associated with being underdeveloped. China was labeled "Third World" for several decades in the 20th century before its robust development of the 21st century. Some countries in the Eastern Bloc, such as Cuba, were often regarded as Third World. The Third World was normally seen to include many countries with colonial pasts in Africa, Latin America, Oceania, and Asia. It was also sometimes taken as synonymous with countries in the Non-Aligned Movement. In the dependency theory of thinkers like Raúl Prebisch, Walter Rodney, Theotônio dos Santos, and others, the Third World has also been connected to the world-systemic economic division as "periphery" countries dominated by the countries comprising the economic "core".

The Eastern Bloc, also known as the Communist Bloc (Combloc), the Socialist Bloc, the Workers Bloc, and the Soviet Bloc, was an unofficial coalition of Communist states of Central and Eastern Europe, Asia, Africa, and Latin America that were aligned with the Soviet Union and existed during the Cold War (1947–1991). These states followed the ideology of Marxism–Leninism and various types of socialism, in opposition to the capitalist Western Bloc. The Eastern Bloc was often called the "Second World", whereas the term "First World" referred to the Western Bloc and "Third World" referred to the non-aligned countries that were mainly in Africa, Asia, and Latin America but notably also included former pre-1948 Soviet ally Yugoslavia, which was located in Europe.

In Western Europe, the term Eastern Bloc generally referred to the USSR and Central and Eastern European countries in the Comecon (East Germany, Poland, Czechoslovakia, Hungary, Romania, Bulgaria, and Albania). In Asia, the Eastern Bloc comprised Mongolia, Vietnam, Laos, Kampuchea, North Korea, South Yemen and China. In the Americas, the countries aligned with the Soviet Union included Cuba from 1961 and for limited periods Nicaragua and Grenada.

The Western Bloc, also known as the Capitalist Bloc, the Freedom Bloc, the Free Bloc, and the American Bloc, was an unofficial coalition of countries that were officially allied with the United States during the Cold War (1947–1991). While the NATO member states, in Western Europe and Northern America, were pivotal to the bloc, it included many other countries, in the broader Asia-Pacific region, the Middle East, Latin America, and Africa with histories of anti-Soviet, anti-communist and, in some cases anti-socialist, ideologies and policies.

As such, the bloc was opposed to the political systems and foreign policies of communist countries, which were centered on the Soviet Union, other members of the Warsaw Pact, and usually the People's Republic of China. The name "Western Bloc" emerged in response to and as the antithesis of its communist counterpart, the Eastern Bloc. Throughout the Cold War, the governments and the Western media were more inclined to refer to themselves as the "Free World" or the "First World", whereas the Eastern bloc was often referred to as the "Communist World" or less commonly the "Second World".

The terms First World, Second World, and Third World were originally used to divide the world's nations into three categories. The complete overthrow of the pre–World War II status quo left two superpowers (the United States and the Soviet Union) vying for ultimate global supremacy, a struggle known as the Cold War. They created two camps, known as blocs. These blocs formed the basis of the concepts of the First and Second Worlds. The Third World consisted of those countries that were not closely aligned with either bloc.

The concept of the First World was originally one of the "Three Worlds" formed by the global political landscape of the Cold War, as it grouped together those countries that were aligned with the Western Bloc of the United States. This grouping was directly opposed to the Second World, which similarly grouped together those countries that were aligned with the Eastern Bloc of the Soviet Union. However, after the Cold War ended with the dissolution of the Soviet Union in 1991, the definition largely shifted to instead refer to any country with a well-functioning democratic system with little prospects of political risk, in addition to a strong rule of law, a capitalist economy with economic stability, and a relatively high mean standard of living. Various ways in which these metrics are assessed are through the examination of a country's GDP, GNP, literacy rate, life expectancy, and Human Development Index. In colloquial usage, "First World" typically refers to "the highly developed industrialized nations often considered the Westernized countries of the world".

The term "Soviet empire" collectively refers to the world's territories that the Soviet Union dominated politically, economically, and militarily. This phenomenon, particularly in the context of the Cold War, is used by Sovietologists to describe the extent of the Soviet Union's hegemony over the Second World.