First World or Developed World is a term used in geopolitics and economics to refer to the richer and more developed nations. In these countries, the majority of the people are in the middle class and enjoy a good standard of living. This term is being used less, as terms like global North and developed world become more common.
The three worlds as they were separated during the Cold War era, each with its respective allies as of the period between 30 April 1975 (the capture of Saigon) and 23 August 1975 (the communist takeover in Laos). Colors do not represent current economic development.
First World: the United States and its allies.
Second World: the Soviet Union, China, and their allies.
