What was the name of the agreement between the U.S. government and the Sioux tribe that guaranteed ownership of the Black Hills?

The Treaty of Fort Laramie is the agreement between the U.S. government and the Sioux tribe that guaranteed ownership of the Black Hills. Signed in 1868, this treaty was significant in establishing boundaries for the Sioux Nation, which included the recognition of the Black Hills as sacred land to the Sioux people. The treaty was intended to create peace and ensure that the U.S. would not encroach upon the designated territory. However, after gold was discovered in the Black Hills in the 1870s, the U.S. government violated the treaty, which led to significant conflicts and legal struggles over the land.

The other options, while they may refer to related topics, do not accurately describe the agreement that specifically guaranteed ownership of the Black Hills. The Greasy Grass Agreement refers to different events and contexts related to the Sioux and the Battle of the Little Bighorn. The Fort Laramie Accord is not a recognized formal treaty name in historical documents. The Black Hills Treaty is not the official title of the agreement, and the term may lead to confusion about the historical context related to it.