How do Events affect uncontacted empires?

Events in Endless Space have three options: Selfish, Helpful and Hostile. The rewards/consequences of these can affect one's own star systems, fleets, etc., or those of enemies, or even those of all empires in the galaxy.
How does this work for empires I haven't met yet? If I choose something that helps/hinders "all empires", does this affect everyone, regardless of whether we've met or not?
Best Answer
Yes, it will effect everyone. Events that state 'All factions/empires' will impact undiscovered players. Note that this is easier to test in multiplayer matches.
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