Contact the Ghanian consulate nearest to you, in NY I presume, or even better, their embassy in D.C.. for guidance on obtaining a certified copy of a Ghanian birth certificate.
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I agree. Contact the Ghana Embassy in the US.
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As my distinguished colleagues suggested, call the closest consulate or embassy and inquire as to how to obtain the birth certificate!
This answer is for informational purposes only and should not be construed as legal advice.