Providing proof of domicile in the United States is critical for most people when submitting Form I864, Affidavit of Support. Typically, in order to claim US domicile, the Affidavit of Support sponsor must be residing in the United States.Both documents must show your first and last names and the same address that is listed on the driver license or identification card application. 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). Top 10 Best India Visa Near Sacramento, California ; 1. You cannot be registered to vote in more than one place at a time. How to Fill Out this Application.