So we have many converging phenomena about the same conclusion: that food production has expanded out of Southwest Asia more easily than from one of the two Americas, and may be easier than in sub-Saharan Africa. These include: food production does not reach ecologically appropriate areas at all; food production expands quickly or slowly and includes plants; and whether the earliest domesticated plants expand rapidly enough to prevent the same domestication or species that are close to other areas. What do the Americas and Africa have to make the expansion of food production more difficult than in Eurasia? To answer this question, let us begin by examining the rapid expansion of food production out of Southwest Asia. Soon after the food production there was generated, around 8,000 BC, a wave of its centrifugation appeared in other parts of Eurasia and North Africa further and further away from the Tongue. sickle much, to the west and east.
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