Mason and Dixon's Line (often called the Mason-Dixon Line) is the boundary between Pennsylvania and Maryland, running at a north latitude of 39°43'19.11". The greater part of it was surveyed from 17631767 by Charles Mason and JeremiahDixon, English astronomers who had been appointed to settle a dispute between the colonies. As the line marked part of the boundary between the free and the slave states, it has come to signify the division between the North and the South.
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