great wall

Other purposes of the Great Wall have included allowing for border control practices, such as check points allowing for the various imperial governments of China to tariff goods transported along the Silk Road, to regulate or encourage trade (for example trade between horses and silk products), as well as generally to control immigration and emigration. Furthermore, the defensive characteristics of the Great Wall were enhanced by the construction of watch towers, troop barracks, garrison stations, signaling capabilities through the means smoke or fire, and the fact that the path of the Great Wall also served as a transportation corridor.
           

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