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5 apr 1765 anni - After completing the portion of the Mason– Dixon line marking the semi-circular boundary between Pennsylvania and Delaware, English surveyors Charles Mason and Jeremiah Dixon begin the two and a half year process of plotting out the 230-mile boundary between Pennsylvania and Maryland along the latitude of 39°43′20″ N

Aggiunto al nastro di tempo:

Data:

5 apr 1765 anni
Adesso
~ 260 years ago