One does not really conquer a place like this. One inhabits it like an occupying army and makes, at best, an uneasy truce with it. New England was completely forested in 1620 and nearly deforested 150 years later; Arkansas saw nine million acres of marsh and swamp forest converted to farms. Through such Promethean effort, the eastern half of the continent was radically made over, for better or worse. The West never can be. The only way to make the region over is to irrigate it. But there is too little water to begin with, and water in rivers is phenomenally expensive to move. And even if you
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