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MASON AND DIXON LINE

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Originally appearing in Volume V17, Page 841 of the 1911 Encyclopedia Britannica.
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MASON AND See also:DIXON See also:LINE , in See also:America, the boundary line (See also:lat. 39° 43' 26.3" N.) between See also:Maryland and See also:Pennsylvania, U.S.A.; popularly the line separating " See also:free " states and " slave " states before the See also:Civil See also:War. The line derives its name from See also:Charles Mason (1730-1787) and See also:Jeremiah Dixon, two See also:English astronomers, whose survey of it to a point about 244 M. See also:west of the See also:Delaware between 1763 and 17671 marked the See also:close of the protracted boundary dispute (arising upon the See also:grant of Pennsylvania to See also:William See also:Penn in 1681) between the Baltimores and Penns, proprietors respectively of Maryland and Pennsylvania. The dispute arose from the designation, in the grant to Penn, of the See also:southern boundary of Pennsylvania mainly as the parallel marking the " beginning of the fortieth degree of Northerne See also:Latitude," after the See also:northern boundary of See also:Mary-See also:land had been defined as a line " which lieth under the fortieth degree of See also:north latitude from the equinoctial." The eastern See also:part of the line as far as Sideling See also:Hill in the western part of the i These surveyors also surveyed and marked the boundary between Maryland and Delaware.See also:present See also:Washington See also:county, was originally marked with mile-stones brought from See also:England, every fifth of which See also:bore on one See also:side the arms of See also:Baltimore and on the opposite side those of Penn; but the difficulties in transporting them to the westward were so See also:great that many of them were not set up. Owing to the removal of the See also:stone marking the north-See also:east corner of Maryland, this point was again determined and marked in 1849-185o by Lieut.-See also:Colonel J. D. See also:Graham of the U.S. topographical See also:engineers; and as the western part of the boundary was not marked by stones, and See also:local disputes arose, the line was again surveyed between 1901 and 1903 under the direction of a See also:commission appointed by Pennsylvania and Maryland. The use of the See also:term " Mason and Dixon Line " to designate the boundary between the free and the slave states (and in See also:general between the North and the See also:South) See also:dates from the debates in See also:Congress over the See also:Missouri See also:Compromise in 1819–182o. As so used it may be defined as not only the Mason and Dixon Line proper, but also the line formed by the See also:Ohio See also:River from its intersection with the Pennsylvania boundary to its mouth, thence the eastern, northern and western boundaries of Missouri, and thence westward the parallel 36° 3o'—the line established by the Missouri Compromise to See also:separate free and slave territory in the " See also:Louisiana See also:Purchase," except as regards Missouri. It is to be noted, however, that the Missouri Compromise did not affect the territory later acquired from See also:Mexico.

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