Well I hate to break it to you, but Nebraska almost classifies as a desert as it is. It does not receive much rain outside of the seasonal storm fronts that move down from the north. It's the grain belt simply because of the enormous aquifers that lay below it. You don't have to go back 6,000 years, only go back 150 (pre-industrialization) and many people were using camels as transportation in order to get across much of the land.
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"Smite the rocks with the rod of knowledge, and fountains of unstinted wealth will gush forth." - Ashbel Smith as he laid the first cornerstone of the University of Texas
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