 British and American negotiators to the 1814 Treaty of Ghent ended the War of 1812 by offering no territorial concessions to either side, but returned to those boundaries set by the Treaty of Paris of 1783.To resolve territorial claims that had precipitated the war, negotiators at Ghent established a process whereby commissioners would survey the boundary to determine the borders envisioned in the original treaty.Beginning in August 1820, two teams of surveyors, including British explorer and cartographer David Thompson, mapped the area of St. Joseph Island, Drummond Island, and Lesser and Greater Manitou Islands (today Cockburn and Manitoulin islands).