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Assuming that Napoleon defeats Russia, crushes Iberian insurgents, and wipes out Austria and Prussia, how much time and effort would Napoleonic Europe need to raise a Navy able to challenge British global naval hegemony (if the Napoleonic Empire and the British Empire revert to a Cold War relationship) or to support an invasion or blockade of the British Isles (if they remain locked, or later relapse, in Hot War) ?
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