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Looking at the cimate map of Mexico and the US, it may also be that corn spreading to the north of US could have been hindered by the climatic conditions in the north of Mexico and south of US, acting as an ecological barrier.
Looking at the cimate map of Mexico and the US, it may also be that corn spreading to the north of US could have been hindered by the climatic conditions in the north of Mexico and south of US, acting as an ecological barrier.