Question: Which major river is Buford, North Dakota nearest to?
Context: Buford is an unincorporated community in Williams County, North Dakota, United States.  It is the nearest community to the Fort Union Trading Post National Historic Site.  It is named for the nearby historic Fort Buford at the confluence of the Missouri and Yellowstone Rivers. Fort Henry on the Missouri River, located at the mouth of the Yellowstone where it enters the Missouri, was established on October 1, 1822 by a party of men led by Major Andrew Henry, who mounted the expedition for the purpose of establishing a fur trade outpost for an area which now encompasses most of Montana, western North Dakota, parts of Wyoming, into Canada.  The site of the fort, which was abandoned in 1823, is approximately 20 mi southwest of Williston, North Dakota near the Montana - North Dakota state line. The Adjutant General of North Dakota is the highest-ranking military official in the State of North Dakota and is subordinate to the Governor of North Dakota.  The Adjutant General is a member of the Governor's Cabinet and advises the Governor on military and emergency management matters.  The Adjutant General is in charge of the North Dakota Army National Guard, North Dakota Air National Guard, the North Dakota Department of Emergency Services (Homeland Security and State Radio), and the North Dakota Civil Air Patrol.  The current Adjutant General of North Dakota is Major General Alan S. Dohrmann. Coal Creek Station is the largest power plant in the U.S. state of North Dakota.  Located near the Missouri River between Underwood, North Dakota and Washburn, North Dakota, it is the largest lignite-fired electricity plant in North Dakota.  Its two generators are each rated at 605 megawatts (Unit 1 went in service in 1979, Unit 2 came online in 1980), with a peak total production of nearly 1.2 gigawatts. The Standing Rock Rural Water System (RWS) is a $30 million water system funded by the American Recovery and Reinvestment Act in 2009 for about 10,000 residents of the Standing Rock Sioux reservation in North Dakota.  The RWS includes the Standing Rock Water Treatment and the "Indian Memorial Intake Pump Station, a raw water pipeline, two transmission pipelines and Kline Butte Storage Reservoir."  The main regulation reservoir of the Standing Rock Rural Water System is the $3.6 million Kline Butte Storage Reservoir, located southwest of Kenel, South Dakota, which consists of a 5 million gallon ground storage reservoir.  Currently, (in December 2016) the intake valve for the water system is "located in a shallow part of the Missouri River near Fort Yates, North Dakota, roughly 20 miles from the planned river crossing of the controversial Dakota Access Pipeline also known as the Bakken pipeline.  The Bakken oil pipeline Dakota line is to be "buried 92 feet below the riverbed in hard clay."  A new valve came online in 2016 in Mobridge, South Dakota which is seventy miles south of the proposed Bakken Pipeline Missouri River crossing.  This Mobridge intake valve is intended to service the entire Standing Rock Sioux reservation. The Red River Valley Research Corridor is the name that has been given to a region in the American state of North Dakota.  It roughly comprises the corridor along the Red River of the North.  The Research Corridor is anchored by North Dakota State University (NDSU) and the University of North Dakota (UND).  The corridor was established in 2002 by United States Senator Byron Dorgan in an effort to draw research dollars to the state.  Since that year, Dorgan has helped to direct $300 million to research in the corridor. The North Dakota Sports Hall of Fame is a hall of fame in the US state of North Dakota honoring individuals for athletic achievements.  According to the Hall, its purpose is "to honor and recognize those individuals who have played a major role in the growth and development of sports in the state of North Dakota, and to further promote sports and sportsmanship to the public of North Dakota by so honoring those who have made outstanding contributions in sports."  The Hall is located in the Jamestown Civic Center in Jamestown, North Dakota. Fort Union Trading Post National Historic Site is the site of a partially reconstructed trading post on the Missouri River and the North Dakota/Montana border, twenty-five miles from Williston, North Dakota.  It is one of the earliest declared National Historic Landmarks in the United States.  The fort, possibly first known as Fort Henry or Fort Floyd, was built in 1828 or 1829 by the Upper Missouri Outfit managed by Kenneth McKenzie and capitalized by John Jacob Astor's American Fur Company. Bismarck is the capital of the state of North Dakota, the county seat of Burleigh County, and the second most populous city in North Dakota after Fargo.  The city was formed in 1872 as "Edwinton" after Edwin Ferry Johnson, a chief engineer for the Northern Pacific Railway company, when the railroad reached the eastern banks of the Missouri River.  The name was changed less than one year later, honoring German chancellor Otto von Bismarck, in an effort to attract German immigrants.  The discovery of gold in the nearby Black Hills in 1874 was the first real impetus for growth.  In 1883, Bismarck became the capital of the Dakota Territory and, in 1889, of the state of North Dakota. Huff is an unincorporated community in Morton County, North Dakota, United States.  Huff is located about 20 miles south of Bismarck, North Dakota on the Missouri River at the top of Lake Oahe, a reservoir created by a dam.  It is located on North Dakota Highway 1806.  Huff is the nearest town to Huff Archeological Site, a U.S. National Historic Landmark.
Answer: the Missouri River