Etymology
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Mason-Dixon Line

by 1779, named for Charles Mason and Jeremiah Dixon, English astronomers who surveyed (1763-7) the disputed boundary between the colonial holdings of the Penns (Pennsylvania) and the Calverts (Maryland). It became the technical boundary between "free" and "slave" states after 1804, when the last slaveholding state above it (New Jersey) passed its abolition act. As the line between "the North" and "the South" in U.S. culture, it is attested by 1834.

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Definitions of Mason-Dixon Line

Mason-Dixon line (n.)
the boundary between Maryland and Pennsylvania; symbolic dividing line between North and South before the American Civil War;
Synonyms: Mason and Dixon line / Mason and Dixon's line
From wordnet.princeton.edu

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