US citizen get married abroad

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Hi everyone, my bf is an American and he lived here for 18 years. He was born in the states but moved here when he was three and been living here ever since. Now he wants to go back to the states and work but he wants to get married to me first before he goes. How long will it be before we can go live in the states? since he wants to work out there. Will it be the wisest thing to do? Help me please.