Iowa admitted to the Union. Governor Hampton approved an act creating 50 new counties including Dickinson County. Treaty of Mendota by which the Yankton Sioux relinquished their claim of land in northwest Iowa and nearby areas. Inkpaduta chose to ignore the treaty. Two trappers spent the winter on the north shore of West Okoboji Lake, but were chased off by the Indians.
Lakes region is homesteaded.
Six cabins built. Inkpaduta and his band of Sioux Indians killed 33 settlers, re-ferred to as the Spirit Lake Massacre. In addition, four young women were taken hostage. Two were killed later, the other two were released to the government. Attempts to capture Inkpaduta over the years failed.