What Documents Do You Need for a U.S. Work Visa Application?

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The document requirements for a U.S. work visa seem to vary significantly depending on the visa category and whether an employer is sponsoring the application. For visas such as H-1B, L-1, O-1, or other employment-based nonimmigrant visas, which documents should an applicant normally have ready for the visa application and consular interview? In particular, what should come from the employer or petition, and what personal, employment, financial, or educational documents should the applicant carry?