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Doctors of Medicine The National Park Service manages most of the 9,122 acres (36.92 km2) of city land owned by the U.S government. Rock Creek Park is a 1,754-acre (7.10 km2) urban forest in Northwest Washington which extends 9.3 miles (15.0 km) through a stream valley that bisects the city Established in 1890 it is the country's fourth-oldest national park and is home to a variety of plant and animal species including raccoon deer owls and coyotes. Other National Park Service properties include the C&O Canal National Historical Park the National Mall and Memorial Parks Theodore Roosevelt Island Columbia Island Fort Dupont Park Meridian Hill Park Kenilworth Park and Aquatic Gardens and Anacostia Park the D.C Department of Parks and Recreation maintains the city's 900 acres (3.6 km2) of athletic fields and playgrounds 40 swimming pools and 68 recreation centers the U.S Department of Agriculture operates the 446-acre (1.80 km2) U.S National Arboretum in Northeast Washington. The most valuable crop that could be grown on a plantation in that climate was cotton That crop was labor-intensive and the least-costly laborers were slaves Demand for slaves exceeded the supply in the southwest; therefore slaves never cheap if they were productive went for a higher price as portrayed in Uncle Tom's Cabin (the "original" cabin was in Maryland) "selling South" was greatly feared a recently (2018) publicized example of the practice of "selling South" is the 1838 sale by Jesuits of 272 slaves from Maryland to plantations in Louisiana to benefit Georgetown University which "owes its existence" to this transaction. ! .
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