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China was surrounded to the west by mountains and deserts. These geographical features kept China isolated from the rest of the world, allowing its civilization to flourish in isolation from Europe and the rest of the world until the development of the Silk Road.
There are more than three reasons why this happened of course but the best three are there they needed more land, resources, and some way to escape the cold.
True, in order to make their mercantilist economy succeed Britain needed to import raw materials from its colonies
Constantinople was the capital of the Byzantine Empire
