Also known as Mason and Dixon line, Mason's and Dixon's line, Mason-Dixon Line, Mason and Dixon's Line
surveyed border line between U.S. states of Delaware, Maryland, and Pennsylvania
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Map of the original Mason–Dixon line (in red) A 1910 illustration of Charles Mason and Jeremiah Dixon surveying the line The Mason–Dixon line, where the Torrey C. Brown Rail Trail becomes the York County Heritage Trail near New Freedom, Pennsylvania
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 (then a part of Pennsylvania) in colonial America.
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