Dakota leaders sign a treaty in Washington, DC, selling their lands east of the Mississippi River for about $500,000 in cash and goods. This treaty, along with the Ojibwe treaty of the same year, opens eastern Minnesota to settler colonists. Representatives for the United States are Joel R. Poinsett and Lawrence Taliaferro, while Wahpe Sa (or Wabasha, meaning Red Leaf), Wakinyan Tanka (Big Thunder), and Maza Hota (Grey Iron) sign for the Dakota.