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Your challenge, should you choose to accept it, is to find a way to make the Greek language (doesn't necessarily have to be Modern Greek, it could be Ancient) the predominant language of culture in the world*, sort of like Latin has been for centuries. You must do this with a POD after 1453. Good luck!
(I hope this gets some replies, it could be very interesting.)
*Note - if you already believe that Greek is the predominant language of culture in the world, please explain why.