In Brave New World, to found World Congress, do i need to be the first to discover Printing Press and:
- A. all other players?
- B. all other players and city states?
You have to meet all the other players (human/computer), city states do not count.
You have to meet only states, either players or AI. City states don't have any political abilities, so you don't have to meet them.
According to http://civilization.wikia.com/wiki/World_Congress_(Civ5) You can also found the World congress by advancing to the Industrial era instead.