What is the Mason-Dixon line?

The Mason–Dixon line, also called the Mason and Dixon line or Mason's and Dixon's line, was surveyed between 1763 and 1767 by Charles Mason and Jeremiah Dixon in the resolution of a border dispute involving Maryland, Pennsylvania, and Delaware in Colonial America. read more

Although the Mason-Dixon line is most commonly associated with the division between the northern and southern (free and slave, respectively) states during the 1800s and American Civil War-era, the line was delineated in the mid-1700s to settle a property dispute. read more

Mason and Dixon Line, also called Mason-Dixon Line, originally the boundary between Maryland and Pennsylvania in the United States. In the pre-Civil War period it was regarded, together with the Ohio River, as the dividing line between slave states south of it and free-soil states north of it. read more