When you start a new job in the US, your employer will ask you to provide documentation proving your employment eligibility. You will need to supply either a single document from List A, or one document from both List B and List C. List A includes documents like a US passport or a Permanent Resident Card, while Lists B and C contain items such as state-issued ID cards and Social Security cards. For more information, you may visit the USCIS resource on acceptable documents.