Well Ontario can't become "America". "North North America" is available though. "Lake of America, the Province"?
Ontario can totally become America. If that's how Trump really wants it, the U.S. can find a new alternate name. Trumpland maybe? Donnyville? Epsteinia?
Dammit maybe that is the play. Bait Ontario into renaming itself America so we have to become "Magastan".