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What is the general situation of the dividing line between agricultural areas and nomadic areas in China's history?
It is bounded by the Great Wall, and the east-west direction of the Great Wall coincides with the 400 mm isoprecipitation line.
Because the annual precipitation below 400 mm is suitable for pasture growth, nomadic industry is developed.
More than 400 mm is suitable for breeding.
So the dividing line is the Great Wall or the 400 mm precipitation line.