That's incredible how the "third world" concept has gone a long way. It was a word play on the Third State of the French Revolution (long story short, the Third State lost a vote by order against Nobility and Clergy, took the Bastille, and it went downhill from there). In the sense that those countries were the majority in number but their voices were ignored. Then they created a "First World" to designate the rulers of the world (Nobility I guess?) and now I discover some "Second World".
