On December 19, 2007, leaders of the Lakota people, a part of the Sioux Nation, traveled to Washington and withdrew from the Treaty of Fort Laramie of 1851 and the Treaty of Fort Laramie of 1868, forming the independent Republic of Lakotah. These two treaties gave areas of the Black Hills in North Dakota, South Dakota and Nebraska to the Sioux, including the Lakota. This was rescinded by an act of Congress in 1877 when gold was discovered in the area. The declaration of independence by the Lakota is viewed as legally permissible under the United Nations Vienna Convention on the Law of Treaties of 1969 [PDF].
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