Final answer:
Rivers are vital in the western United States for providing drinking water to cities, irrigating farmlands, and shaping landforms.
Step-by-step explanation:
Rivers are important to the western United States for multiple reasons. They provide drinking water for many cities, such as the Colorado River supplying water to several states. Additionally, rivers irrigate farm lands, enabling agricultural productivity. Finally, rivers do not create large deserts. Instead, they often carve through existing landforms and can contribute to the formation of canyons, like the Grand Canyon in Arizona.
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