Between the years 1763 and 1767, Charles Mason and Jeremiah Dixon surveyed and established a line to resolve a border dispute between the colonies of Maryland, Pennsylvania, and Delaware. Over a period of years, the survey became known as the “Mason-Dixon line. The line had no relevance to slavery because at that time slavery existed in all colonies but by the turn of the 19th century, the Mason-Dixon Line had come to symbolize a division between Northern and Southern States. At the beginning of James Monroe’s first term as President in 1817, there were 19 States. 11 States were north of the Mason-Dixon Line and 9 States were south of it. At that time, the imaginary dividing line still had no relevance to slavery.