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The empire established Zoroastrianism as the state religion. The empire collapsed due to Islaminc Arab armies who overthrew the empire.
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Constantinople was the imperial empire. Constantinople was Europe's largest and wealthiest city.
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Christians were determined to recover Jerusalem from Muslim rule.
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The Hundred years of war were a series of campaings over the control of the throne in France between the English and French.
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The Sui empire was a dynasty in China. Founded by Emperor Wen of Sui. Emperor Wen and Yang worked to lessen the economic gap between the rich and poor. The empire eventually collapsed due to revolts and disunity.