Can you get married as a duel citizen of Japan and America?

I am currently 21 and a duel citizen in Japan and the US. In Japan you have to decide your nationality when you turn 22. I am going to be getting married to a US citizen in the next few months and was wondering if it is allowed to get married as a duel citizen in those countries. I’ve researched online but I... show more I am currently 21 and a duel citizen in Japan and the US. In Japan you have to decide your nationality when you turn 22. I am going to be getting married to a US citizen in the next few months and was wondering if it is allowed to get married as a duel citizen in those countries. I’ve researched online but I couldn’t find anyone in the same situation. Would I have to decide before I get married?
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