The Umayyad and Abbasid empires were in effect large free-trade areas in which old borders and barriers had been swept away, especially along the Euphrates River, since remotest antiquity the traditional frontier between the East and West. No longer were the three great routes to Asia—the Red Sea, the Persian Gulf, and the Silk Road— competing alternatives; rather, they were an integrated global logistic system available to all parties who recognized the suzerainty of the caliphate.
-William J. Bernstein
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