The discovery of what resource,in 1874,in the Black Hills of South Dakota caused the U.S.government to break their treaty with the Dakota Sioux?

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The discovery of gold in 1874 in the Black Hills of South Dakota caused a gold rush and led to significant encroachment on the land that the Dakota Sioux had been promised in the Treaty of Fort Laramie. The U.S. government unilaterally broke the treaty and forced the Sioux to give up their land, leading to conflict and the eventual Battle of Little Bighorn.

The Discovery of What Resource,in 1874,in the Black Hills of South