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The Copernican Revolution was the paradigm shift from the Ptolemaic model of the heavens, which described the cosmos as having Earth stationary at the center of the universe, to the heliocentric model with the Sun at the center of the Solar System.
first here's the definition of a Proxy War : A proxy war is an armed conflict between two states which act or on behalf of other parties that are not directly involved in the hostilities. so the US government aided Africa even though they were not directly involved in the war themselves.
Since then the Great Wall was built, rebuilt to protect the northern borders of the Chinese Empire from the Hun's and Mongolian attacks during the rule of successive dynasties.
Answer: as a century progressed, suburbs drained people and their resources from the city.
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