Williams v. United States
Headline: Court blocks application of Arizona’s broader under‑18 rape rule on an Indian reservation and reverses a non‑Indian man’s conviction, holding federal law—not state law—controls offenses on federal reservations.
Holding: The Court held that the Assimilative Crimes Act does not allow a State to expand or redefine federal sexual‑offense law on a reservation, so Arizona’s under‑18 statutory‑rape rule could not be applied to convict the man.
- Prevents states from applying broader age‑of‑consent rules on federal Indian reservations.
- Limits prosecutions and punishments to federal crime definitions for similar conduct.
- Reverses the conviction of a non‑Indian man charged under Arizona’s under‑18 rule.
Summary
Background
A married white man was indicted and convicted for having sexual intercourse in 1943 on the Colorado River Indian Reservation in Arizona with an unmarried Indian girl over 16 but under 18. No force or lack of consent was alleged. The case reached the Supreme Court because it raised the question whether the Assimilative Crimes Act lets Arizona’s broader age‑of‑consent rule apply on a federal reservation.
Reasoning
The Court considered whether the Assimilative Crimes Act allows a State to expand or redefine a federal crime when the conduct occurs on federal land. It found that federal law already addresses related offenses: rape requires proof of force and lack of consent, carnal knowledge covers females under 16, and adultery and fornication also make the acts penal under federal law. Because Congress had defined and punished these kinds of sexual offenses, the Court ruled the Assimilative Crimes Act cannot be used to enlarge those federal definitions or to impose the State’s harsher punishment.
Real world impact
The Court reversed the lower court and rejected using Arizona’s under‑18 rule to convict the defendant. The decision makes clear that where Congress has defined an offense and set punishments, state law cannot be applied through the Assimilative Crimes Act to broaden criminal liability on federal reservations. This affects prosecutions of non‑Indians for sexual conduct with Indians on reservations.
Dissents or concurrances
Justice Rutledge agreed with the result. Justice Jackson did not participate in the decision.
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