You want to know if other states in the region require such proof. Prior to 1967, a naturalized citizen or person born overseas of a U.S. citizen parent had to show proof of citizenship. Now a registrar of voters or other admitting official can ask for proof of a person's place of birth when registering a new voter in person. The law specifies the documents that constitute conclusive proof of citizenship. In the other New England states, California, New Jersey, and New York, the voter registration form an applicant signs includes an eligibility statement or assertion that the person completing it is a U.S. citizen.
States allow an official to ask for proof when a registrant's eligibility is challenged.
Vermont law explicitly bars officials from asking for additional information to support the information in the application form. Connecticut law does not require applicants to show proof of citizenship before registering to vote and has not since at least 1967. Before that, if an applicant was a naturalized citizen, was born abroad of American parents, or became a citizen because of a naturalized parent or spouse, he had to present certain documentation of his citizenship. To register, a person must indicate on the registration form whether he is a U.S. citizen. An admitting official may require an applicant to prove his identity, place of birth, age, and residence.