Passage: Before European settlement of North America, Minnesota was populated by a subculture of Sioux called the Dakota people. 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 out the state.

Question: What did the explorers map out?
the state