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Dear Ms. Rosen,
Thank you for posting your request on History Hub!
Since he was born in Toronto, Canada, please contact Ontario Services to request a copy of his birth certificate at https://www.ontario.ca/page/get-or-replace-ontario-birth-certificate or you may request it at https://vitalcertificates.ca/province/ontario/birth-certificate.
We suggest that you review the National Archives website for immigration-related research tips as well as read an article published in NARA’s Prologue magazine on Canadian Border Crossing Records for more information.
We hope this is helpful. Best of luck with your family research!