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Because of its cities, cities in the Muslim Empires were built magnificently with building structures, Mosques, Markets, libraries, and schools. The Islamic also flourished because of trade which allowed people from different places to contribute their knowledge.
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Family, bands, or tribe's.
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The Articles of Confederation were discarded because they "failed to create a functional national government." Without a strong central government, trade was almost impossible.
Coal was used to run trains and factory machines.