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In page New Sweden:

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On March 4, 1681, what had been the colony of New Sweden was formally partitioned into the colonies of Delaware and Pennsylvania. The border was established 12 miles north of New Castle, and the northern limit of Pennsylvania was set at 42 degrees north latitude. The eastern limit was the border with New Jersey at the Delaware River, while the western limit was undefined.[7] In June 1681, Upland ceased to exist as the result of the reorganization of the Colony of Pennsylvania, with the Upland government becoming the government of Chester County, Pennsylvania.[citation needed]