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I came up with a scenario idea: the Italians perform better in the invasion of Venetia during the astro-prussian war, and so they decide to not only invade the papal states, but they also declare war on France after the battle of Sedan, and this makes austria declare war in the northern german confederation and Italy, but this comes too late as they fail to save the french, but the russians fearing that could happen if the germans and italians defeat not only France, but austria too (and possibly annexing austria into GrossDeutscheland) they align with austria, and thus provokes a alt history WWI

What would happen under such scenario? Could the british ally with prussia to contain Russia? What about the ottomans? would they join the northern german-italian alliance to try to take some land from Russia and Austria? And who would be most likely to win?
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