 The Treaty of Traverse des Sioux in 1851 gave all of the Wahpeton and Sisseton Sioux ( upper Sioux ) lands west of the Mississippi River to the U.S. government . The Treaty of Mendota that same year ceded the Mdewakanton and Wahpekute Sioux ( lower Sioux ) lands in southern Minnesota , requiring relocation to an area near modern Morton . Both treaties , however , were amended to during the ratification process to eliminate the explicit guarantees of lands retained by the tribes . Additionally much of the promised payments were never delivered in part ostensibly because of debts owed by the Sioux to the fur traders . 
 The Treaty of Traverse des Sioux in 1851 gave all of the Wahpeton and Sisseton Sioux ( upper Sioux ) <a href='uninflect' title='1'><mark>lands</mark></a> west of the Mississippi River to the U.S. government . The Treaty of Mendota that same year ceded the Mdewakanton and Wahpekute Sioux ( lower Sioux ) <a href='uninflect' title='2'><mark>lands</mark></a> in southern Minnesota , requiring relocation to an area near modern Morton . Both treaties , however , <a href='uninflect' title='3'><mark>were</mark></a> amended to during the ratification process to eliminate the explicit guarantees of lands retained by the tribes . Additionally much of the promised payments <a href='uninflect' title='4'><mark>were</mark></a> never delivered in <a href='negative_concord' title='5'><mark>part</mark></a> ostensibly because of <a href='negative_concord' title='6'><mark>debts</mark></a> owed by the Sioux to the fur traders . 
The Treaty of Traverse des Sioux in 1851 gave alll of the Wahpeton and Sisseton Sioux ( upper Sioux ) land west of the Mississippi River to the U.S. government . The Treaty of Mendota dat same year ceded the Mdewakanton and Wahpekute Sioux ( lower Sioux ) land in southern Minnesota , requiring relocation to an area near modern Morton . Both treaties , however , was amended to durin da ratification process to eliminate tdaexplicit guarantees of lands retained by thdaribes . Additionally much of thedaomised payments was never delivered in no part ostensibly because of no debts owed by the daux to the fdatraders .