National Department of Interior Signs Cooperative Agreement with Sisseton-Wahpeton Oyate as Next Step in Land Buy-Back Program by Gary Kopycinski on April 8, 2014 Gary Kopycinski Author More in National: Rep. Kelly Condemns FDA Approval of Flavored E-Cigarettes May 6, 2026 Wisconsin Legislative Black Caucus Introduces Constitutional Amendment to Ban Slavery in Wisconsin February 24, 2026 Martha Washington’s Enslaved Maid Ona Judge Made a Daring Escape to Freedom – but the National Park Service Has Erased Her Story From Philadelphia Exhibit February 14, 2026 Sisseton-Wahpeton Oyate of Lake Traverse Reservation in North & South Dakota Join Latest Step in Nation-to-Nation Cooperation to Strengthen Tribal Sovereignty