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Muslims fought for power over the Byzantines and it was the only interactions.
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The conquered territories by the Arabs had gone out to the Atlantic Ocean to India.
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He created a government that helped conquer new lands.
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Umar worked to lay the foundations of an Islamic state to administer the new lands conquered by Arab armies.
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Battles with different tribes.
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He wanted the religion to continue after he died. But it didn't go as planned because after he died his advisers just wanted him to be the leader they didn't want anyone else.
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He was the Jesus of Islam