In the 18th century, Mason and Dixon surveyed and marked out this boundary line.
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The Mason-Dixon line was surveyed by Charles Mason and Jeremiah Dixon between 1763 and 1767. It became the informal boundary between the northern and southern states in the American Civil War era.
A historical boundary line between Pennsylvania and Maryland. Became a cultural symbol dividing the American North (free states) and South (slave states) before and during the Civil War.
