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by AnimalMuppet 1836 days ago
Yes, I meant the west of the USA. West of the 100th Meridian, you're west of the western edge of the Gulf of Mexico, and therefore you get significantly less rain.

You can see this when you're driving. If you drive west on I-70, the trees stop about 20 miles west of Salina Kansas. On I-80 you're close to the Platte River so it's not quite as stark.