The Mason-Dixon Line: What? Where? And why is it
2019-9-30u2002·u2002The Mason–Dixon line along the southern Pennsylvania border later became informally known as the boundary between the free (Northern) states and the slave (Southern) states. It is unlikely that Mason and Dixon ever heard the phrase 'Mason–Dixon line'. The official report on the survey, issued in 1768, did not even mention their names.
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