USA HISTORY

Detailed explanation-1: -On October 18, 1767, Charles Mason and Jeremiah Dixon complete their survey of the boundary between the colonies of Pennsylvania and Maryland as well as areas that would eventually become the states of Delaware and West Virginia.

Detailed explanation-2: -The line was established to end a boundary dispute between the British colonies of Maryland and Pennsylvania/Delaware.

Detailed explanation-3: -Between Pennsylvania and Maryland: The parallel (latitude line) 15 miles (24 km) south of the then southernmost point in Philadelphia, measured to be at about 39°43′ N and agreed upon as the Maryland–Pennsylvania line.

Detailed explanation-4: -The Mason-Dixon Line also called the Mason and Dixon Line is a boundary line that makes up the border between Pennsylvania, Delaware, and Maryland. Over time, the line was extended to the Ohio River to make up the entire southern border of Pennsylvania.

Detailed explanation-5: -Between 1763 and 1767 the 233-mile (375-km) line was surveyed along the parallel 39°43′ N by two Englishmen, Charles Mason and Jeremiah Dixon, to define the long-disputed boundaries of the overlapping land grants of the Penns, proprietors of Pennsylvania, and the Calverts, proprietors of Maryland.