Apply for British citizenship if you're married to, or in a civil partnership with, a British citizen - form AN, who's eligible, fees and how to apply. Customers applying for a UK Visa from the USA may visit one of over 130 USCIS Application Support Centers to provide their biometric information.Be over the age of eighteen. This video generally explains how you can naturalise as a British Citizen. After you marry in the United States, you and your spouse will file Form I385. If USCIS approves your Form N400, Application for Naturalization, we will schedule you to take the Oath of Allegiance at a naturalization ceremony. Contact any U.S. Social Security office or your Federal Benefits Unit if you cannot provide these documents. In practice, this means that the spouse seeking a green card must have a valid visa for up to 2.5 years after filing the marriage-based green card application. It does mean that you will often need to fill out paperwork, have a bit of a wait, and then you need to get married during a certain time frame. 2715c and determine the next-of-kin of an American citizen who dies abroad.