 In July, the delegation signed an agreement with Sisseton and Wahpeton Dakota known as the Treaty of Traverse des Sioux.The United States still needed the approval of the eastern Dakota, however.Wacouta I, along with Wapasha III and Taoyateduta (Little Crow IV), all experienced leaders of the Mdewakanton, agreed to confer with Lea and Ramsey in Mendota, Minnesota.