The Mason-Dixon is an imaginary line that travels 244 miles. The line is famous for dividing the North from the South during the Civil War. Originally it was created in 1767 to settle an eighty-year old border argument between the states of Pennsylvania and Maryland. The line can be found bordering the states of Delaware, Maryland, Pennsylvania, and West Virginia. Find out more about how one British astronomer and one American surveyor created the line by clicking here!