52 U.S.C. § 20503 — National procedures for voter registration for elections for Federal office

(a) In general unless subsection (b), even if another federal or state^* law says otherwise, in addition to any other method of voter registration provided for under State law, each State must establish procedures to register to vote in elections for Federal office^*—
(1) by application made simultaneously with an application for a motor vehicle driver’s license^* under section 20504 of this title ;
(2) by mail application under section 20505 of this title ; and
(3) by application in person—
(A) at the appropriate registration site chosen for the residence of the applicant under State law; and
(B) at a Federal, State, or nongovernmental office chosen under section 20506 of this title.

(b) Nonapplicability to certain States This chapter does not apply to a State described in either or both of these paragraphs:
(1) A State in which, under law that is in effect continuously on and after August 1, 1994, there is no voter registration requirement for any voter in the State for an election^* for Federal office.
(2) A State in which, under law that is in effect continuously on and after August 1, 1994, or that was enacted on or before August 1, 1994, and by its terms is to come into effect upon the enactment of this chapter, so long as that law remains in effect, all voters in the State may register to vote at the polling place at the time of voting in a general election for Federal office.