The study controlled for dozens of other potentially determining factors: What if already-sexist cultures chose the plough? Does religion have as great an effect as the plough? And so on. But a thorough regression analysis led them to rule out these other potential factors and to conclude that, in fact, it was the plough itself that did women in, by creating conditions of female oppression. Further proof: the researchers found that anywhere in the world that was a better environment for growing plough-negative crops, such as maize, sorghum, tree crops, and root crops, today has more equality
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