I know that the title sounds like a colossal joke about the common confusion between the words secession and succession, but it was this very thing that established the Empire of Brazil, for example. It is also this mix-up that helped inspire my short story Rapt. Basically, the British quashing the American Rebellion (although it was more of a Continental collapse than a British victory) and the subsequent reorganization of the Colonies into (four in my case) independent Dominions with the British monarch as head of state. These Dominions pass Acts of Settlement soon after, where male-preference primogeniture (the Prince of Wales as heir) is replaced by absolute primogeniture (the Princess Royal Alexandra.) At the demise of the crowns, the Princess Royal is also married to the ex-Holy Roman Emperor; she abdicates in favor of her eldest son William, who becomes king of the American dominions, and acclaimed and soon crowned Emperor of North America. Are there any other stories with this secession-by-succession trope?