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Why did the U.S. government negotiate the First Treaty of Fort Laramie in 1851?

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Plains Wars View of the army camp at Hidden Wood Creek during Lieut. Col. George Armstrong Custer's Black Hills expedition, 1874; photograph by W.H. Illingworth.

The U.S. government negotiated the First Treaty of Fort Laramie in 1851 primarily to forestall conflict and manage the challenges posed by westward expansion. As the colonial frontier moved past the Mississippi River, the California Gold Rush and the opening of the Oregon Trail brought a surge of travelers across sovereign Indigenous lands, leading to increased tensions and attacks on settlers.12

The United States sought to achieve several specific objectives through the treaty:

Territorial Delineation: To clearly define land boundaries between the United States and the various tribes, as well as to establish peace between the tribes themselves.2
Infrastructure Development: To secure permission for the construction of roads and military fortresses within the region to support westward migration.12
Settler Safety: To guarantee the safety of Euro-American settlers traveling to the West Coast.2

In exchange, the tribes sought to establish legal title to their lands and obtain formal guarantees that their territories would be held inviolate. While the treaty initially brought a period of relative tranquility, it ultimately failed to prevent future conflict as encroachment on these lands continued.21