Cite as: 522 U. S. 329 (1998)
Opinion of the Court
Justice O'Connor delivered the opinion of the Court.
This case presents the question whether, in an 1894 statute that ratified an agreement for the sale of surplus tribal lands, Congress diminished the boundaries of the Yankton Sioux Reservation in South Dakota. The reservation was established pursuant to an 1858 Treaty between the United States and the Yankton Sioux Tribe. Subsequently, under the Indian General Allotment Act, Act of Feb. 8, 1887, 24 Stat. 388, 25 U. S. C. § 331 (Dawes Act), individual members of the Tribe received allotments of reservation land, and the Government then negotiated with the Tribe for the cession of the remaining, unallotted lands. The issue we confront illustrates the jurisdictional quandaries wrought by the allotment policy: We must decide whether a landfill constructed on non-Indian fee land that falls within the boundaries of the original Yankton Reservation remains subject to federal environmental regulations. If the divestiture of Indian property in 1894 effected a diminishment of Indian territory, then the ceded lands no longer constitute "Indian country" as defined by 18 U. S. C. § 1151(a), and the State now has primary jurisdiction over them. In light of the operative language of the 1894 Act, and the circumstances surrounding its passage, we hold that Congress intended to diminish the Yankton Reservation and consequently that the waste site is not in Indian country.
I
A
At the outset of the 19th century, the Yankton Sioux Tribe held exclusive dominion over 13 million acres of land between the Des Moines and Missouri Rivers, near the boundary that currently divides North and South Dakota. H. Hoover, The Yankton Sioux 25 (1988). In 1858, the
Frankie Sue Del Papa of Nevada, Jan Graham of Utah, and William U. Hill of Wyoming.
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