Treaty of Fort Laramie (1851)

The Fort Laramie Treaty of 1851 was signed on September 17, 1851 between United States treaty commissioners and representatives of the Cheyenne, Sioux, Arapaho, Crow, Assiniboine, Mandan, Hidatsa, and Arikara nations. The treaty is an agreement between nine more or less independent parties. The treaty set forth traditional territorial claims of the tribes as among themselves. The United States acknowledged that all the land covered by the treaty was Indian territory and did not claim any part of it. The boundaries agreed to in the Fort Laramie treaty of 1851 would be used to settle a number of claims cases in the 20th century. The Native Americans guaranteed safe passage for settlers on the Oregon Trail and allowed roads and forts to be built in their territories in return for promises of an annuity in the amount of fifty thousand dollars for fifty years. The treaty should also "make an effective and lasting peace" among the eight tribes, each of them often at odds with a number of the others.

Although many European and European-American migrants to western North America had previously passed through the Great Plains on the Oregon and Santa Fe Trails, the California gold rush beginning in 1848 greatly increased traffic. The next year, both Thomas Fitzpatrick (agent of Upper Platte and Arkansas) and David D. Mitchell (superintendent at Saint Louis) recommended a council with the Indians to prevent a conflict. The United States government undertook negotiations with the Native American Plains tribes living between the Arkansas and Missouri rivers to ensure protected right-of-way for the migrants. The Congress had appropriated one hundred thousand dollars to the assembly, endorsed by Luke Lea (the Commissioner of Indian Affairs).

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