In 1805, Lieutenant Zebulon Pike acquired Pike's Purchase from the Sioux Nation for the United States, comprising 100,000 acres (400 km²) of land in the area. Significant European-American settlement began in the late 1810s. Following the War of 1812, the United States Department of War built a chain of forts and installed Indian agents at them between Lake Michigan and the Missouri River. These forts primarily protected the northwestern territories from Canadian and British encroachment. The Army founded Fort Saint Anthony in 1819.
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