Which is the correct position to be taken. From how I’m reading the EO (and I’m very much welcome to be corrected) the name for that body of water has been bifurcated. The EO uses meticulous detail as to what the coverage of the change applies to. It does not apply to the entire body of water. It’s almost as tho there is (now) an invisible line across the body of water, where previously both sides of the line had the same name, because it was the given name, and was considered usual and customary, and no one really objected to it. Whomever the author of the EO was, they seem to be well aware that the authority to change the name on both sides (of that invisible line) does not exist. I’m not even sure if the OSM database contains a way that demarcates the position of the invisible line.
Some digging leads me to the following …
Executive Order promulgating the new name
Section 4, (b):
to rename as the “Gulf of America” the U.S. Continental Shelf area bounded on the northeast, north, and northwest by the States of Texas, Louisiana, Mississippi, Alabama and Florida and extending to the seaward boundary with Mexico and Cuba in the area formerly named as the Gulf of Mexico.
The operative phrases are U.S. Continental Shelf and seaward boundary.
This document at NOAA (Maritime Zones and Boundaries) has more details, and begins with a graphic picture that shows where the U.S. Continental Shelf extends to. Beneath the graphic are two paragraphs, the second of which says:
For the official description of the U.S. maritime boundaries with other nations, contact the U.S. Department of State.
I have not followed down that rabbit hole, but it clearly recognizes that other nations have rights, and that what are likely to be treaties exist.
Now, having poked around a bit more, I came across this document ( The U.S. ECS ) which has now been updated to show exactly where the new name Gulf of America applies. So someone at State has been trying to correctly delineate the extent of the name change, and it does not apply to the entire body of water.
Taking the EO, and applying it to the entire Gulf of Mexico|America seems like a leap, beyond what the EO says (and very possibly was the intention from the get-go).
Should OSM do a bifurcation is way above my pay grade, but the evidence suggests it is a possible way forward.