18 USC 2426 - Repeat offenders

(a) Maximum Term of Imprisonment.— 
The maximum term of imprisonment for a violation of this chapter after a prior sex offense conviction shall be twice the term of imprisonment otherwise provided by this chapter, unless section 3559 (e) applies.
(b) Definitions.— 
In this section
(1) the term prior sex offense conviction means a conviction for an offense
(A) under this chapter, chapter 109A, chapter 110, or section 1591; or

view counter
(B) under State law for an offense consisting of conduct that would have been an offense under a chapter referred to in paragraph (1) if the conduct had occurred within the special maritime and territorial jurisdiction of the United States; and
(2) the term State means a State of the United States, the District of Columbia, and any commonwealth, territory, or possession of the United States.