Based on historic trade and migration routes between the Mediterranean and Persia, India, and China, are the populations in Lebanon, Iraq, and Syria more heterogeneous than that of their neighbors? Were these differences exploited by imperial powers, and did they lead to factionalism, and ultimately to civil war?
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To no extent at all is the wars in the middle east caused by trade making the area heterogeneous. All empires in the world have been multi-cultural, having heterogeneous populations does not cause problems or conflicts. Having a heterogeneous population is not used to "divide and conquer", although it can be used to increase your power by tricking your support-base into believing that the other people are evil.