We needed a climate with a sufficient lack of seasonality so crops could be grown and harvested year-round, thus eliminating the starving season. We needed consistent water flows so that those crops could be relied upon to sustain us year-in, year-out. We needed places where nature provided good, sturdy natural fences so that the neighbors couldn’t just walk in and help themselves to our labor-fruits. We needed a different Geography of Success. THE WATER REVOLUTION The only places on Earth that sport all three criteria are rivers that flow through low-latitude and low-altitude deserts. Some
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