9 ottob 1767 anni - Surveying of the "Mason–Dixon line", which will later become the traditional division between the northern and southern states of the United States, is completed by Charles Mason and Jeremiah Dixon after four years, initially to settle a boundary dispute between the colonies of Delaware, Pennsylvania and Maryland.

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The survey party is halted at Dunkard Creek when a chief of the Mohawk Indians tells them that they are in Native American territory and that the Mohawks guiding the property "would not proceed one step further Westward"; the line, slightly west the 80th meridian west, is now part of the boundary between Pennsylvania and West Virginia.

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