America is an extremely common synonym for the USA, for better or worse. It's not convincing to imply that you believe a president of the USA, renowned for his nationalist rhetoric and pettiness, renamed a geographic feature bordering Mexico and the USA from "The X of Mexico" to "The X of America" not as a reference to the USA.

Regardless, it's antagonistic to the namesake for no good reason, no matter what the new name is.