it shows the legal name within the U.S.

This is highly debatable. The wikipedia entry does not mention that name until halfway down:

Trump directed federal agencies to adopt the name “Gulf of America” for the waters bounded by the U.S. Some major online map platforms and several U.S.-based media outlets voluntarily adopted the change, but it also stoked controversy, with Mexican president Claudia Sheinbaum and others objecting to the declaration

Comapring this bovine excrement to disputed borders leaves a very bad aftertaste for me.