Review documents against the current facts and the applicable instructions rather than mechanically reusing every page.
Keep historical records identifiable
An older letter may explain past employment without documenting a present offer. Preserve accurate history and obtain relevant current evidence where the facts require it.
If the reissued letter differs from the original in duties, title, salary, or dates, that difference should be explainable by something real, such as a restructure, rather than by editing. Bring the spouse's own citizenship documents, education and professional credentials, and a description of the type of work being considered, whether a specific offer, remote work, or general interest. If a degree in the field exists, the certificate and transcript carry the requirement and the experience evidence becomes supporting context rather than the foundation. Assemble the complete signed offer, duties schedule, credential proof, passport, and every document that affects current or future control. The employer letter should describe the degree accurately rather than calling it a biology degree, because a mismatch between the letter and the diploma is exactly the inconsistency that causes a refusal. The applicant should also assemble proof of Canadian or Mexican citizenship and the evidence demanded by the chosen USMCA profession, including a reliable credential evaluation where applicable. Keep proof of the current status and the prior employer's letter available for comparison, as a reviewer will want to confirm the new role is genuinely distinct and properly supported.