18 U.S.C. § 3581: Sentence of imprisonment

(a) In General.—A defendant who has been found guilty of an offense may be sentenced to a term of imprisonment. (b) Authorized Terms.—The authorized terms of imprisonment are—(1) for a Class A felony, the duration of the defendant’s life or any period of time; (2) for a Class B felony, not more than twenty-five years; (3) for a Class C felony, not more than twelve years; (4) for a Class D felony, not more than six years; (5) for a Class E felony, not more than three years; (6) for a Class A misdemeanor, not more than one year; (7) for a Class B misdemeanor, not more than six months; (8) for a Class C misdemeanor, not more than thirty days; and (9) for an infraction, not more than five days.