Taken on April 29, 1868, this historic photograph shows Lieutenant General William T Sherman and leaders of the Sioux Nation signing the Treaty of Fort Laramie in Wyoming. It was an agreement that the tribes would relocate to the Black Hills in the Dakota Territory, which would be part of the Great Sioux Reservation and off-limits to white settlers.

That agreement would be broken just six years later, in 1874, after General Custer’s Black Hills expedition and gold discovery caused a land grab on the reservation.

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