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Yeah I've been noticing a reference to this n game every once in a while, even as early as 1870, when I was playing as Sweden Prussia asked me to join them in their war against Austria/France and in little text it said 'we participate in the Great War'.
2 Great Powers vs. 2 Great Powers = Great War...effects of which will mean Great Prestige loss/gain depending on outcome. And I think, not totally sure, if the 4th GP to enter (thus making it into a Great War) gets a prestige hit.