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The difficulty is faced only by historians.
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The Historians would face no dilema as they would have learnt everything that happened in the altered timeline, instead of what happened in reality to us. Unless of course it was the historian that changed history, but in which case, you could end up with two sets of memories. One set of memories for your life that you actually lived, and another set of memories for your life in the alternate timeline. The more you change history to more memories you come up.