The three major mountain ranges of the US are the Appalachian Mountains, the Rocky Mountains, and the Sierra Nevada.
The Appalachian Mountains run for 1,500 miles along the east coast of the United States from northern Alabama to Maine. Some of the smaller ranges within the Appalachians include the Great Smoky Mountains, the Blue Ridge Mountains, Green Mountains, White Mountains, Longfellow Mountains, and the Berkshires. The Rocky Mountains form the longest mountain range in North America and the second longest range in the world. Within the Rocky Mountains are several smaller ranges including the Big Horn Mountains, the Front Range, the Wasatch Mountains, and the Bitterroot Range.
The Sierra Nevada Mountain Range runs north-to-south along the west coast of the United States mostly in the state of California and some in the state of Nevada. The Sierra Nevada Mountains are fault-block mountains, meaning they were formed along a fault in the Earth's crust. Cascade Range - The Cascade Range runs for 700 miles along the northwest coast of the United States and into Canada.

Ozarks - The Ozarks form the largest mountain range between the Appalachians and the Rockies. Alaska Range - The Alaska Range is the tallest mountain range in the United States and is home to Mount McKinley, the tallest mountain in North America at 20,237 feet above sea level.
Alaska Range: Mountains of south-central Alaska that extend from the Alaska Peninsula to the border of the Yukon Territory, Canada. Western Continental Divide is an imaginary line that sits atop a continuous ridge of mountain summits that divide the continent into two main drainage areas. The Rocky Mountains, about 3,000 miles in length, extend from the U.S State of New Mexico up through the western United States and on into the northernmost reaches of Canada's British Columbia. Sierra Maestra (Cuba)Sierra Nevada: This mountain range of eastern California is about 400 miles in length. There are several national parks protecting areas of the Rockies such as Yellowstone National Park, Rocky Mountain National Park, Grand Teton National Park, and Glacier National Park. Mitchell in North Carolina at 6,684 ft (2,037 m)Brooks Range: Mountains of northern Alaska.

At one point, Britain made a deal with the Native American tribes that colonists would not settle beyond the Appalachian Mountains. The highest point in the Sierra Nevada Mountains is Mount Whitney at 14,505 feet, which is also the tallest mountain in the lower 48 United States. It is considered part of the Ring of Fire which is a number of volcanic mountains that circle the Pacific Ocean. Minor hills and mountains are found in the Ozark Plateau of Missouri, and in the Boston Mountains and Ouachita Mountains of northwestern Arkansas and eastern Oklahoma.
However, people soon found passes through the mountains and blazed trails beyond the mountains such as Daniel Boone's Wilderness Trail.
Much of the Rocky Mountains is covered with forests of spruces trees, pines, oaks, junipers, and firs.

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