>>1360322Different tectonics and geology. North American plate is moving westward towards Asia, creating the North American cordillera on the entire western half of both north and south America, while the eastern half is comparatively flat. Although some parts of the northern rockies remind me very much of the alps. I'll post several examples.
>>1360326The North American cordillera is the 2nd most mountainous on Earth after the Himalayan region of Asia. While the western US alone has the 2nd highest average elevation of any mountain region on Earth and has the same number of peaks as the entire European alps.
