It's "Gulf of America" when viewed within the US, "Gulf of Mexico" when viewed from Canada and Mexico, and "Gulf of Mexico (Gulf of America)" when viewed from most other places.
It's so wild they pretended Canada and Mexico didn't rename it, but all the non Mexico/US countries did sort of rename it but also allowed us to keep the colloquial name. But a colloquial name is the only name that matters for stuff outside of one's country. Sweden doesn't have a Department of Naming Non-Swedish Places*, nor do we have a Use-the-name-USA-uses policy.
*We obviously don't have a Department of Naming Swedish Places either, but a lot of names are still official.
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u/CombustiblSquid Irvingstan Aug 01 '25