The southern boundary-line which separated the free states of
Pennsylvania from what were at one time the slave states of Maryland
and Virginia. It lies in 3943' 26' north latitude, and was run by
Charles Mason and Jeremiah Dixon, two English mathematicians and
surveyors (between November 15th, 1763, and December 26th, 1767).
More on Mason and Dixon's Line from Infoplease:
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