In 1763-67 Charles Mason and Jeremiah Dixon surveyed and marked most of the boundaries between Maryland, Pennsylvania and the Three Lower Counties that became Delaware.
Beginning in the mid-1730s, violence erupted between settlers claiming various loyalties to Maryland and Pennsylvania. The border conflict would be known as Cresap's War
The survey, commissioned by the Penn and Calvert families to settle their long-running boundary dispute, provides an interesting reference point in the region’s history.
The Line was drawn 100 years before the Civil War it became so closely associated with. The Mason-Dixon Line was not drawn in conflict with the Union or Emancipation.
My great grandfather was a Union soldier, enlisting from Maine. I was born in Virginia and grew up in Georgia, steeped in sweet tea. During the 50's and 60's I thought of myself as a southerner. The Vietnam Nam war overhauled my regionalism. Then the Mason-Dixon Line became geology instead of sociology.