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The fall of the empire happened in 476 AD. This was where the Eastern part of the Roman Empire was affected by the results of previous actions, such as: getting help from barbarians as a means to conquer lands, which later then the Barbarians invaded their lands , higher ups abusing their power and having people lose their trust in them and etc.

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The Dark Ages is usually referring to the first half of the Middle Ages from 450 to 1000 AD.  This is a historical period that asserts that a demographic, cultural, and economic deterioration occurred in Western Europe following the decline of the Roman Empire.

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The middle ages was a thousand year period between the end of the Roman Empire and the Renaissance, which lasted from 450 to 1450 AD.

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The terms medieval and middle ages can be used interchangeably, as they both refer to the same period of time. This period was from 450 to 1450 AD.