What was the rationale to do it. Was it in the name of accuracy? Does it further US national interests or have any other benefit?
Canadian statehood and renaming the Gulf of Mexico were never brought up during the campaign. These actions serve no interest other than to antagonize American allies. They weaken the security posture of the United States, and that is ultimately the point, like soon to be DNI Gabbard.
These things serve a real purpose which is to troll the easily offended. In that, it's a huge success, as every breath wasted whingeing about this harmless renaming is one that isn't used to ask good questions like "Why fight a trade war with Canada instead of asking why we even have free trade with a country (Mexico) whose wages are so low that it promotes the gutting of American industry." That would be a good question to ask Trump.
We should have a bilateral trade deal with Canada, which would strengthen both countries, and cut Mexico out of it. But all this has distracted from how poorly he's executing his tariff strategy.
but anyway, what i heard was that former president passed a bunch of EO's banning all future oil drilling in the Gulf of Mexico. I guess the easiest way to invalidate them was the rename the Gulf.