*The concept of the First World originated during the Cold War, involving countries that were aligned with the UnitedStates and the United Kingdom. These countries were largely market economies and generally democracies. After the fall of the Soviet Union, the term "First World" arguably took on a new meaning, coming to be largely synonymous with developed countries.
During the Cold War, relationships between the "First World" and the "SecondWorld" of Communist states were typically competitive, ideological and hostile.* http://en.wikipedia.org/wiki/First_World