Mason-Dixon Line accuracy hailed as 'extraordinary' "The map they produced is one of the most important historical documents we have here in America. It's almost the equivalent of the Declaration ...

16, 2020 12:00 p.m. A group of surveyors from Pennsylvania and Maryland starting this year plan to create a new record of what might be America’s most famous border: the Mason-Dixon Line.

Most of us have heard of the Mason-Dixon line, but far fewer of us – particularly ... hundreds of thousands of enslaved ...