the roman republic began to expand when rome fought the punic wars and defeated carthage. the punic wars refer to the series of 3 wars fought among rome and carthage, before it ended in carthage's defeat.
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It is useful for historians to write narratives so that history can be passed on from their point of view. think about a story being told in third person, then think about it again being told in first person, by someone who actually experienced the event.