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Actually, I suspect there is an enormous amount of land that's unused or underused that could be used for raising food animals. Of course, that land is not near the major population centers (which is why it's un/under utilized).
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Much of that land
was used for food production. The mechanization of our entire food production system has forced almost all of the small production farms out of business. In the last century, a large percentage of subsistence farms/small production farms have all but dried up. The depression started this trend as either the dust bowl or mortgage defaults forced farmers off their land and into the urban areas looking for work. The resulting changes in the way most Americans lived, in part, forced us to find different ways of producing cheap food. It's all sort of an unavoidable digression similar to those that can be found in many areas of our modern life.
Our overspecialization in almost every area of life could very well be our downfall. Just think about it... if any one part of our ultra complex way of life breaks down we are almost totally reliant on thousands of other people to provide the most basic necessities to sustain life.