The climate of the western United States will be different if the Sierra Nevada mountain range didn't exist because this mountain is responsible for the moisture and precipitation in this region.
The western portion of the Sierra Nevada receives moisture and precipitation as air moves upward over the mountain range. When the air moves over the mountain, the wind cools, and moisture condenses into clouds and precipitation.
So we can conclude that the climate of the western United States will be different if the Sierra Nevada mountain range didn't exist because this mountain is responsible for the moisture and precipitation in this region.
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