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; Carroll served in the Maryland Senate, 9 Ideology and factions Further information: Post-presidency of George Washington, Events leading to. . I-66 in Washington D.C, "A necessary evil", 8 External links Ownership of slaves and position on slavery. 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. Main article: 1860 United States presidential election, Schools of thought[show], A large majority of profit-oriented free black slaveholders resided in the Lower South For the most part they were persons of mixed racial origin often women who cohabited or were mistresses of white men or mulatto men . Provided land and slaves by whites they owned farms and plantations worked their hands in the rice cotton and sugar fields and like their white contemporaries were troubled with runaways; Further information: Western theater of the American Revolutionary War In 1751 Washington made his only trip abroad when he accompanied Lawrence to Barbados hoping that the climate would cure his brother's tuberculosis. Washington contracted smallpox during that trip which immunized him but left his face slightly scarred. Lawrence died in 1752 and Washington leased Mount Vernon from his widow; he inherited it outright after her death in 1761.

. The river itself is at least 3.5 million years old, likely extending back ten to twenty million years before present when the Atlantic Ocean lowered and exposed coastal sediments along the fall line This included the area at Great Falls which eroded into its present form during recent glaciation periods. . .