'This 18th c. line & its extensions westward became the boundary between Northern & Southern states'
the Mason-Dixon line
A LINE: This 18th c. line & its extensions westward became the boundary between Northern & Southern states
This 18th c. line & its extensions westward became the boundary between Northern & Southern states
This 18th c. line & its extensions westward became the boundary between Northern & Southern states
A LINE
the Mason-Dixon line
A LINE