Appalachians.
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* The Appalachian Mountain Range * Rocky Mountain Range
Appalachian Mountains
It would have to be the Rockies.
The longest mountain range in the U.S. is the Rocky Mountains. The tallest is the Alaska Range, which is where Mt. McKinley (also known as Denali), the tallest mountain in North America is located.
The longest mountain range in the United States is the Rocky Mountains.