The Chippewa and Superior national forests comprise . The Superior National Forest in the northeast contains the Boundary Waters Canoe Area Wilderness, which encompasses over a million acres (4,000 km2) and a thousand lakes. To its west is Voyageurs National Park. The Mississippi National River and Recreation Area (MNRRA) is a corridor along the Mississippi River through the Minneapolis–St. Paul Metropolitan Area connecting a variety of sites of historic, cultural, and geologic interest. Before European settlement of North America, a subculture of Sioux called the Dakota people lived in Minnesota. As Europeans settled the east coast, Native Americans moved away from them, causing migration of the Anishinaabe (also known as Ojibwe) and other Native Americans into the Minnesota area. The first Europeans in the area were French voyageur fur traders who arrived in the 17th century and began using the Grand Portage to access trapping and trading areas further inland. Late that century, Anishinaabe migrated westward to Minnesota, causing tensions with the Dakota people. Explorers such as Daniel Greysolon, Sieur du Lhut, Father Louis Hennepin, Jonathan Carver, Henry Schoolcraft, and Joseph Nicollet mapped the state. The region was part of Spanish Louisiana from 1762 to 1802. The portion of the state east of the Mississippi River became part of the United States at the end of the American Revolutionary War, when the Second Treaty of Paris was signed. Land west of the Mississippi was acquired with the Louisiana Purchase, though part of the Red River Valley was disputed until the Treaty of 1818. By the late 1700s, the North West Company had established the post of Fort Charlotte at the Lake Superior end of the Grand Portage. It moved 50 miles northeast to Fort William in 1803. In 1805 Zebulon Pike bargained with Native Americans to acquire land at the confluence of the Minnesota and Mississippi rivers. The construction of Fort Snelling followed between 1819 and 1825. Its soldiers built a grist mill and a sawmill at Saint Anthony Falls, the first of the water-powered industries around which the city of Minneapolis later grew. Meanwhile, squatters, government officials, and sight-seers had settled near the fort. In 1839 the army forced them to move downriver and they settled in the area that became St. Paul. Minnesota Territory was formed on March 3, 1849. The first territorial legislature (held September 2, 1849) was dominated by men from New England or of New England ancestry.