The process:
1. Get a dating profile on several sites and actively scan for ugly or grossly overweight white women.
2. Make her fall in love with you - have a good, made-up backstory ready about your background - tell her you are a PhD in your country, or was on the Olympic team but got injured - anything that you think will impress her.
3. Arrange for a vacation trip to the US after she's fallen for you - get her to pay for the ticket.
4. Close your eyes and make believe you are having sex with one of the top 10 Rate This Girl Coli girls as you do your thing. In her after-sex glo, suggest how life with her in the US would be bliss - make her want to live that life and suggest that she can sponsor, etc.
5. Travel back to the Bahamas and let her work the immigration. You will have to get married.