Colorado, known as 'the Centennial State,' contains most of the southern Rocky Mountains as well as the northeastern part of the Colorado Plateau. Colorado is the eighth most extensive state in the country. The state derives its name from the Colorado River which was named by Spanish travelers for the ruddy silt carried from the mountains. The state was admitted to the Union in 1876 by Ulysses S. Grant.
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Denver is both the capital and the largest city in Colorado. Denver can be found in the South Platte River Valley, east of the front range of the Rocky Mountains. Denver has acquired the nickname "Mile-High City" because its official elevation is exactly 5,280 feet above sea-level. Denver has nearly 80 official neighborhoods used by the city for administration and planning. The character of these neighborhoods varies differently and could include large skyscrapers or even houses from the late 19th century. Typically, neighborhoods that are closer to the city's center are older and contain more brick. The neighborhoods further away from the city were most likely developed after World War II and were built with more of a modern flair. Most neighborhoods in the Denver area have been built around parks as a focal point. Some of the most well-known neighborhoods include LoDo (Lower Downtown), the Union Station neighborhood, Speer neighborhood, and the Golden Triangle. Other cities in the Denver metropolitan area include Aurora, Littleton, and Castle Rock.