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October 18, 1767 The Mason-Dixon line, the boundary between Maryland & Pennsylvania is agreed upon.
https://pabook.libraries.psu.edu/li...icles/our-most-famous-border-mason-dixon-line
The Mason-Dixon line was marked with stones having the Penn family crest (Pennsylvania) on the north side and the Calvert family crest (Maryland) on the south side
https://pabook.libraries.psu.edu/li...icles/our-most-famous-border-mason-dixon-line
The Mason-Dixon line was marked with stones having the Penn family crest (Pennsylvania) on the north side and the Calvert family crest (Maryland) on the south side