This Day In History

 

October 10, 1767

On October 10, 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. The Penn and Calvert families had hired Mason and Dixon, English surveyors, to settle their dispute over the boundary between their two proprietary colonies, Pennsylvania and Maryland.

Taken from: https://www.history.com/this-day-in-history/october-10/mason-and-dixon-draw-a-line