<P> The term "Third World" arose during the Cold War to define countries that remained non-aligned with either NATO or the Communist Bloc . The United States, Canada, Japan, South Korea, Western European nations and their allies represented the First World, while the Soviet Union, China, Cuba, 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 and economic divisions . Since the fall of the Soviet Union and the end of the Cold War, the term Third World has been used less and less . It is being replaced with terms such as developing countries, least developed countries or the Global South . The concept itself has become outdated as it no longer represents the current political or economic state of the world . </P> <P> 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, Theotonio dos Santos, and Andre Gunder Frank, the Third World has also been connected to the world - systemic economic division as "periphery" countries dominated by the countries comprising the economic "core". </P>

What is the definition of a first second and third world country
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