How was Minnesota acquired?

The Minnesota Territory was acquired by the United States as part of the Louisiana Purchase from France in 1803. After the Louisiana Purchase, the northern U.S. border extended from Lake of the Woods to the Rocky Mountains, a border disputed by Great Britain. This area, which would become Minnesota, was part of the Red River of the North Valley and claimed by Selkirk settlers before the War of 1812. However, after negotiations, the ownership was transferred from Great Britain to the U.S. at the Treaty of 1818.