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Your challenge, if you should choose to accept, is to have a pan-Melanesian movement, successful in creating a Melanesian state. It can be unitary, a federation, or a confederation. Extra points for a socialist Melanesia (shouldn't be too hard, actually). A million points for a Soviet-aligned satellite state, especially if missiles are aimed from there at Australia or New Zealand. (actually, this sounds like an awesome TL. Might do it some time)