On February 28, 1877, the US Congress ratified the Manypenny Agreement with the Lakota Sioux, under which the United States took control of 900,000 acres of the Black Hills.



Read the ratification act, which includes the terms of the Agreement. The Lakota argue to this day that the Agreement is illegal, was obtained by coercion associated with starvation, and that the Black Hills should be returned to them.