Answer: The term "Third World" arose at the time of the Cold War, calling the countries that were neither on the US side nor on the USSR side, the so - called "non - aligned".
Used for the first time by the French demographer Alfred Sauvy, the expression, now in disuse, was extremely important during the Cold War, as it represented under the same name all countries that did not fit in the context of the “USA x USSR” dispute.
