How do I get him to come back with me as a fiancé if I wish to marry my boyfriend in Ghana?

File a Form I-129F if you are an American citizen. Go to uscis web site download the form and follow the instructions

He cannot just come back with you if he does not have a valid visa. If you want to marry him in the US, you have to petition for him as your fiance. If you want to marry him in Ghana, you can do that and then petition for him as your spouse. Both processes will take about 9-12 months from filing to visa issuance.

Your question requires an attorney consultation. It is not a simple question that can be answered on this type of forum. There are many factors that would need to be considered and evaluated. I strongly suggest that you contact an experienced immigration attorney for a face-to-face consultation and give him/her all of the facts surrounding your situation. He/she would then be in a better position to analyze your case and advise you of your options.

If you want to marry him in Ghana, you do it and make sure that marriage will be recognized in the US. Then come back and petition for him on I-130 form. If petition is approved, he will have an interview there and then should be allowed to come to you. You can also petition for him on a fiance visa, gather certain documents. He would have an interview in the consulate there and should be allowed to come to the US. When in the US, you will have 90 days to marry him. Then you may adjust his status and get a permit for him to work here while his documents were being processed. In both situations, you would have to show to the Government certain documents of your relationship with your fiance.

Apply for a K-1 visa.

If you have physically seen your fiance within the last 2 years, you can petition for him to come to the US on a K-1 fiance visa. The petition is filed on form I-129F. After he arrives in the US on his K-1 visa, you must marry him within 90 days and then he can apply for adjustment of status on form I-485.