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"The Arc" that forms most of Delaware's northern boundary with Pennsylvania was defined as an arc 12 miles in radius from the then-New Castle County courthouse in the town of New Castle. Delaware's southern border was set by agreement between the Penn and Calvert families of Pennsylvania and Maryland respectively as a line (the Transpeninsular Line) which basically ran 35 miles west from Fenwick Island to the mid-point of the DelMarVa peninsula. Delaware's western boundary, which makes up the first 86 miles of the Mason-Dixon Line, runs generally northward to a tangent point on the 12-mile arc and then continues north to Pennsylvania's southern border. This actually left a small "wedge" between the arc and Pennsylvania's southern boundary; it was claimed by both Delaware and Pennsylvania until agreement was reached in 1893 and it became part of Delaware.

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15y ago

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