territory comprised the coasts of Newfoundland, the entirety of Prince Edward Island, Nova Scotia and the coasts of New Brunswick, the Saint Lawrence River and the Gulf of Saint Lawrence. Then 1603–1673, in which, due to westward expansion and conflicts with Great Britain, the Canada territory was now composed of the coasts of the Saint Lawrence River, of the Gulf of Saint Lawrence and of the Great Lakes, as well as southern Ontario and northern New England. Then, in the last period of 1673–1741, the Canada territory was composed of the coasts of the Saint Lawrence River, of the Gulf of Saint Lawrence and of the Great Lakes, southern Ontario, southern Manitoba and the north-eastern Midwest. It is in this period that Canada was at its largest. Pays d'en Haut Dependent on Canada were the Pays d'en Haut (upper countries), a vast territory north and west of Montreal, covering the whole of the Great Lakes and stretching as far into the North American continent as the French had explored. Before 1717, when it ceded territory to the new colony of Louisiana, it stretched as far south as the Illinois Country. In the Great Lakes area, a mission, Sainte-Marie among the Hurons, was established in 1639. Following the destruction of the Huron homeland in 1649 by the Iroquois, the French destroyed the mission themselves and left the area. In what are today Ontario and the eastern prairies, various trading posts and forts were built such as Fort Kaministiquia in 1679 (at modern Thunder Bay, Ontario), Fort Frontenac in 1673 (today's Kingston, Ontario), Fort Saint Pierre in 1731 (near modern Fort Frances, Ontario), Fort Saint Charles in 1732 (on Lake of the Woods located on Magnusens Island on the Northwest Angle of Minnesota) and Fort Rouillé in 1750 (today's Toronto). The mission and trading post at Sault Ste. Marie (1688) would later be split by the Canada–US border. The French settlements in the Pays d'en Haut among and south of the Great Lakes were Fort Niagara (1678) (near modern Youngstown, New York), Fort Crevecoeur (1680) (near the present site of Creve Coeur, Illinois, a suburb of Peoria, Illinois), Fort Saint Antoine (1686) (on Lake Pepin in Wisconsin), Fort St. Joseph (1691) (on the southernmost point of St. Joseph Island, Ontario on Lake Huron), Fort Pontchartrain du Détroit (1701) (today's Detroit, Michigan), Fort Michilimackinac (1715) (on the Straits of Mackinac at Mackinaw City,