The Answers is:
Probably the most important single cause of Byzantine empire collapse was its recurrent debilitating civil war. Three of the worst periods of civil war and internal infighting took place during Byzantine empire decline
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The different factors that contributed to Persia's major success as an influential empire were transportation, coordination, and their tolerance policy. Persia being accepted by those that they ruled is one of the reasons why it became successful because there weren't many rebellions during the Persian rule.
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A parliamentary system of government means that the executive branch of government has the direct or indirect support of the parliament. This support is usually shown by a vote of confidence. .... The head of state may be an elected president or, in the case of a constitutional monarchy, hereditary.
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That everyone is created equal
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