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While I was reading about Louis XV of France I've found this interesting fact: from the 10 children that he and Marie Leszczynska had, only two were male, and only the dauphin Louis Ferdinand survived childhood. So, WI the Dauphin had been born a girl, or had died in childhood too? Would Louis Philippe I, Duke of Orleans, become king in 1774 when Louis XV dies? Or could Charles III of Spain claim the French throne to him or one of his sons? Could we have a War of the French Succession?Of course, if Louis XV doesn't have a son at the time of his wife death (1768) he could have married again in order to provide a male heir. However, just for the sake of the OP, let's assume that he doesn't remarry, or if he does his second wife also doesn't deliver a son.