The renaming has been discussed on the community forum at https://community.openstreetmap.org/t/gulf-of-america-gulf-of-mexico/124571. The name will remain The Gulf of Mexico, but the US official name can be added. I'm going to revert this edit but if you disagree, please let me know. I'd also suggest going to the forum to discuss why you believe this should be the correct tagging.
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            Published using OSMCha: https://osmcha.org/changesets/162515347
            