A Canadian passport, the diploma with a transcript, employment letters covering the qualifying experience, and a signed offer letter from the U.S. employer describing duties, dates, salary and reporting line.
Order the folder the way it will be read
An officer reads for a short time, in a fixed sequence: who are you, what are you qualified as, what are you going to do. Build the folder in that order. Citizenship first.
Then the credential, with the diploma and a transcript that names the programme, because a certificate that says only Business Diploma raises a question the transcript answers. Then the experience letters, arranged newest first with the dates visible. Then the U.S.
offer, which should state the employer, the property, the duties, the term, the salary and who supervises the position. Nothing else is needed and volume can hurt: an inch of certificates and awards buries the three documents that matter. Every name must match, with a change-of-name document bridging any discrepancy.