| http://www.w3.org/ns/prov#value | - ilization.. its mostly to do with climate.The riverine regions are the best for this but are plagued by mosquitos, malaria means that populations remain small and there wont be enough for major irrigation works, meaning no large state structures, rain fed agriculture in the north was handicapped by climate change.The period before 1000AD was perfect for northern agriculture, 1000 to 1400 unstable
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