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Mason–Dixon Line.
surveyed border line between U.S. states of Delaware, Maryland, and Pennsylvania
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About Mason–Dixon Line
The Mason–Dixon line, sometimes referred to as Mason and Dixon's Line, is a demarcation line separating four U.S. states: Pennsylvania, Maryland, Delaware and West Virginia. It was surveyed between 1763 and 1767 by English surveyors and astronomers Charles Mason and Jeremiah Dixon as part of the resolution to Cresap's War, a border conflict involving Maryland, Pennsylvania, and Delaware in colonial United States.
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