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What if, by some miracle (short of ASB) the tribes of the Mongolian steppe managed to get united by the end of the XII century and conduct a successful conquest of China on the East and territories to the West and South all the way to include most of the modern Russia, Ukraine, Iran, Iraq and most of Turkey? Something like what you can see on the map below (as you understand, the "campaigns" on the map are purely imaginable):


Clearly, this is a pure fantasy but what would it take to accomplish this task and what would be the effects of its implementation?
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