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.
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It would have to be the Rockies.
The tallest mountain in the US is Mount McKinley at 20,320ft
Appalachians.
Mt. McKinley in Alaska at 20320 feet high. Second to that is Mt. St. Elias in Alaska at 18008 feet high, so 2312 feet.
Appalachian Mountains.