Bringing the hate facts:
When Francisco Hernández de Córdoba landed on what is now Cabo Catoche, March 1, 1517, he asked the Maya what they called that body of water, and they told him the Mayan name was "The Gulf of Mexico." And he respected their native beliefs. And so it is.
If you're stupid.
It's had a lot names. Various maps from 16th to 19th Century have it as Mare de Nort, Mar del Norte, Gulf of Florida, Golfo de Florida, Golfo de Cortés, Gulf of St. Michael, Sinus Michaelis, Golfo de Iucatan, Mare Iuchatanicum, Great Antillean Gulf, Sinus Magnus Antillarum, Cathayan Sea, Mare Cathaynum, Gulf of New Spain, Golfo de Nueva España, and probably a bunch more.
The US controls more coastline and area of the body of water than Mexico does, and both Mexico and the US are in the Americas. What is now both North and South America were considered one continent in US textbooks until the 1950s, and still are in much of the world.
So the name varies on where you are and your language. The US calling that large body of water off the Atlantic the Gulf of America doesn't stop the Mexicans from calling it the Gulf of Mexico (Golfo de México). And I bet you never used the Spanish nomen for it, so what does it matter?
So let's talk about the non-existent Persian Gulf. There is no Persian Gulf, no matter what you call it.
(al-Khalīj al-ʻArabī; Arab Gulf or Arabian Gulf) لخليج العربي
If you get stationed at any military or State Dept facility in Saudi Arabia, Kuwait, the Trucal Arab States, you will be warned up front there is an ARABIAN Gulf. They do not acknowledge the Persians. It would be like referring to "Russian Poland." Just as there is no "French Channel." If you refer to the "Persian Gulf," you will probably be given leeway by your hosts, but it will irritate them. Do it deliberately and there will be issues of some kind.
Over here, you probably call it the Persian Gulf, and that's fine. The Turks call it the "Gulf of Basra" (Basra Körfezi). In Iran it's the "Khlij Fars" (خلیج فارس). "Persian Gulf."
So the name varies on where you are and your language. The US calling that large body of water off the Atlantic the Gulf of America doesn't stop the Mexicans from calling it the Gulf of Mexico (Golfo de México). And I bet you never used the Spanish nomen for it, so what does it matter?
This is despite some of the stupidest comments by allegedly educated liberals:
"We don't own it, so we have no right to rename it."
As noted above, we own more of it than Mexico does.
"It was the Gulf of Mexico before America existed. Learn history!"
America was named on April 25,1507. Ten years before colonizers named the Gulf in various forms in Spanish.
Next time we're at my wife's family's place, we'll be swimming and boating in "the Gulf."
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BTW, you DO comprehend that Trump doing this is largely distraction for idiots, right? While you're shrieking over this, you're not hassling him over his real work of dismantling the National Socialist police state.
Of course you don't, because you're ignorant and stupid.