It's not just California: the whole Southwest is facing a growing water crunch

All through the 20th century, the United States built a concrete army of dams around the West to tame rivers, generate electricity, and store up water in reservoirs for cities and farms. This intricate water system is why metropolises like Los Angeles, Las Vegas, and Phoenix have been able to flourish in what's basically a desert. It's what makes farming possible in California's Imperial Valley or central Arizona.
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