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At the moment I'm fiddling with an idea that sees the Franco-Prussian War turn into a World War in 1870. Frankly I'm having a hard time coming up with a possible action that would create such an event during the war itself. I really don't want to have a secret treaty between the French and someone. The Austrians though wanting revenge for 1866 know the Hungarians wouldn't support such a war. The Italians want stuff the French are guarding or have. The Russians, are not likely taking part in this and I don't know if its possible at first to get the British in on this.
So I'm asking you guys, what is possible to get the F-P War to go into a World War or start it on the path to becoming one?