Can non-citizens vote in North Dakota because the state does not require voter registration?
No.
While North Dakota is the only state without voter registration, it does not rely on self-affirmation to prove citizenship. Instead, qualifications are strictly verified at the polls through mandatory voter identification laws under North Dakota Century Code 16.1-01-04.1.

To cast a ballot, individuals must prove their identity, age, and 30-day precinct residency using a valid North Dakota driver's license, non-driver ID, tribal ID, or long-term care certificate. The North Dakota Department of Transportation issues distinct identification types to non-U.S. citizens. Crucially, North Dakota's central voter record automatically flags these specific non-citizen IDs so poll workers can prevent them from voting.
Furthermore, voters lacking compliant identification cannot simply sign an affidavit; they must cast a "set-aside" ballot, which is only counted if they present a valid, verified ID to the county auditor within 13 days of the election.
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Sources:
North Dakota Secretary of State Forms of Voter ID
North Dakota Secretary of State 10 PRINCIPLES of NORTH DAKOTA Elections
Ballotpedia Voter ID in North Dakota
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