If you want to sponsor someone for a family-based green card, you need to provide proof of a U.S. domicile in your Affidavit of Support (Form I-864). Driver's License or State ID: As it shows your permanent residence, a valid U.S. driver's license can act as proof of domicile.Apply at this Consulate General in person. Show documentation of intent to establish California residency dating at least one year and one day prior to the start of the semester. 3.