How do I invite my boyfriend from Ghana to the Us

Your boyfriend has to apply for a visitor visa and qualify based upon his own financial situation. If he's got a steady job and/or property ownership (which would prove he has a reason to return to his country) he would probably get approved. But if he intends to get married and remain in the US permanently, then that would be in conflict with his intent to visit. Accordingly, he would be denied. You should consult with an immigration lawyer for more specific advice.