Which US boundary line was named after two English surveyors who surveyed the area in the 1760s?
History of Maryland the Potomac River and territory northward to the fortieth parallel. This was found to be a problem, as the northern boundary would have put Philadelphia, the major city in Pennsylvania, within Maryland. The Calvert family, which controlled Maryland, and the Penn family, which controlled Pennsylvania, decided in 1750 to engage two surveyors, Charles Mason and Jeremiah Dixon, to establish a boundary. They surveyed what became known as the Mason–Dixon Line, which became the boundary between the two colonies. The crests of the Penn family and of the Calvert family were put at the Mason–Dixon line to mark it. In Chesapeake
Northern boundary of Massachusetts no line of latitude. This gave New Hampshire even more than it had claimed, as Pawtucket Falls was south of the mouth of the Merrimack. At this time, the present northern boundary of Massachusetts was established. The location where these two surveyed lines met (the straight westward line and the curved line following the Merrimack River) was marked by a pine tree called the "Old Boundary Pine". The tree was marked by George Mitchell, one of the surveyors, on March 21, 1741 to indicate the location where the lines met. The pine tree is long gone, but the point (officially