A us citizen going to greece to marry a nigerian man who has lived in greece 13 years and what do we have to do legally to wed?

a us citizen going to greece to marry a nigerian man who has lived in greece 13 years and what do we have to do legally to wed?

You can't bring him back to US immediately after getting married. If you have met him in person before in the past 2 years, better file a petition for fiancé visa for him. Petition must be submitted to USCIS. This will allow him to enter US for 90 days, if you get married within 90 days then he will be eligible to apply for adjustment of status and become lawful permanent resident.

Don't get married if you know his background or feel uncertain about it. He may not be eligible to obtain green card. There are restrictions on eligibility and other consequences that you should know before making this decision.