The Treaty of Mendota was signed in Mendota, Minnesota on August 5, 1851 between the United States federal government and the Mdewakanton and Wahpekute Dakota people of Minnesota.
The agreement was signed near Pilot Knob on the south bank of the Minnesota River and within sight of Fort Snelling. The treaty stipulated that the Mdewakanton and Wahpekute bands were to receive US$1,410,000 in return for relocating to the Lower Sioux Agency on the Minnesota River near present-day Morton, Minnesota along with giving up their rights to a significant portion of southern Minnesota.
With the signing of the Treaty of Mendota along with the earlier Treaty of Traverse des Sioux, most of southern Minnesota became open to white settlement.
Map of ceded territory can be seen through the Library of Congress here in orange
(names are presented here in original forms as written and spelled by American's in the treaty itself)
ARTICLE 1.
The peace and friendship existing between the United States and the Med-ay-wa-kan-toan and Wah-pay-koo-tay bands of Dakota or Sioux Indians shall be perpetual.
ARTICLE 2.
The said Med-ay-wa-kan-toan and Wah-pay-koo-tay bands of Indians do hereby cede and relinquish all their lands and all their right, title and claim to any lands whatever, in the Territory of Minnesota, or in the State of Iowa.
ARTICLE 3.
[Stricken out.] (see end of section and note contribution to the Dakota War of 1862)
ARTICLE 4.
In further and full consideration of said cession and relinquishment, the United States agree to pay to said Indians the sum of one million four hundred and ten thousand dollars, ($1,410,000,) at the several times, in the manner and for the purposes following, to wit: