Penn–Calvert Boundary Dispute

The Penn–Calvert boundary dispute (also known as Penn vs. Baltimore) was a long-running legal conflict between William Penn and his heirs on one side, and Charles Calvert, 3rd Baron Baltimore and his heirs on the other side. The overlapping nature of their charters of land in Colonial America required numerous attempts at mediation, surveying, and intervention by the king and courts of England to ultimately be resolved. Subsequent questions over these charters have also been adjudicated by American arbitrators and the Supreme Court of the United States. The boundary dispute shaped the eventual borders of five U.S. states: Pennsylvania, Maryland, Delaware, New Jersey, and West Virginia.

In 1629, Samuel Godin and Samuel Blommaert sent agents of the Dutch West India Company to negotiate with the local Nanticoke tribe to purchase land on Cape Henlopen near present-day Lewes, Delaware. With the support of New Netherland's colonial leadership at New Amsterdam, a new colony named Zwaanendael was established on the purchased land in 1631 by David Pietersz de Vries. The colony proved to be very short-lived, as conflicts with the Nanticoke led to it being wiped out within a year. A second attempt at establishing a colony at that location in 1632 was soon abandoned.

On June 20, 1632, King Charles I granted Cecil Calvert, 2nd Baron Baltimore a charter for land along the Chesapeake Bay. The northern boundary of the charter was the 40th parallel, and the eastern boundary was the Delaware Bay and the Atlantic Ocean. However, the charter only granted the Calverts the right to "uncultivated" lands. The colonists arrived in Maryland in 1634, but made no attempts at surveying the northern border or colonizing the area along the Delaware Bay.

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