Lewis and Clark Expedition

Fort Mandan was the name of the encampment at which the Lewis and Clark Expedition wintered in 1804-1805. The encampment was located on the Missouri... River approximately twelve miles from Washburn, North Dakota, though the precise location is not known for certain and may be under the nearby river. The fort was built of cottonwood lumber cut from the riverbanks. It was triangular in shape, with high walls on all sides and a gate facing the riverbank. The Corps of Discovery started the fort on November 2, 1804, and remained in the area until April 7, 1805. They built the fort slightly down river from the nearby Mandan tribe's village. The Mandan were a tribe that Lewis was specifically told to trade with by then President Thomas Jefferson. During the Corps' stay at the Fort, the Sioux threatened to attack the Mandan village along with the explorers. Although several small parties of Sioux did attack, no major conflict arose. Also, the winter was very cold with temperatures sometimes dipping to minus 45 degrees Fahrenheit and quite a few men of the expedition were frost-bitten.
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St. Louis /seɪnt ˈluːɪs/ is an independent city on the eastern border of Missouri, United States. With a population of 319,294,... it was the 58th-largest U.S. city at the 2010 U.S. Census. The Metropolitan Statistical Area population of 2,812,896 is the 18th-largest in the country. The Greater St. Louis combined statistical area's population of 2,878,255 is the 16th-largest CSA in the country, the fourth-largest in the Midwest, and the largest in the state. However, the city of St. Louis itself is the second largest city in the state, behind Kansas City The city of St. Louis was founded in 1764 by Pierre Laclède and Auguste Chouteau, and after the Louisiana Purchase, it became a major port on the Mississippi River. Its population expanded after the American Civil War, and it became the fourth-largest city in the United States in the late 19th century. It seceded from St. Louis County in 1876, allowing it to become an independent city and limiting its political boundaries. In 1904, it hosted the 1904 World's Fair and the 1904 Olympic Games.
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Pittsburgh is the second-largest city in the US Commonwealth of Pennsylvania and the county seat of Allegheny County. Regionally, it anchors the... largest urban area of Appalachia and the Ohio River Valley, and nationally, it is the 22nd-largest urban area in the United States. The population of the city in 2010 was 305,704, while that of the seven-county metropolitan area stood at 2,356,285. Downtown Pittsburgh retains substantial economic influence, ranking at 25th in the nation for jobs within the urban core and 6th in job density. The characteristic shape of Pittsburgh's central business district is a triangular tract carved by the confluence of the Allegheny and Monongahela rivers, which form the Ohio River. The city features 151 high-rise buildings, 446 bridges, two inclined railways, and a pre-revolutionary fortification. Pittsburgh is known colloquially as "the City of Bridges" and "the Steel City" for its many bridges and former steel manufacturing base. While the city is historically known for its steel industry, today its economy is largely based on healthcare, education, technology, robotics, and financial services.
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