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Oh no, the US will starve relying on the enormous strip of super fertile land between Texas and Idaho.

Point is, the US needs to consume the food more than we need to grow it. The water is not that great a threat.

Actually if California stopped producing food we would still be fine. Most of what is produced is fruits.

Most likely the US could halt 1/2 of its food production and still have plenty of food. We have no shortage of arable land, we have a greater shortage of people actually wanting to be farmers/ranchers :(

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