We were Americans when you were still English chattle.
In fact, Latin America was America before the British colonies (here, not your home) were.
Yet folks like you (and apparently Trump, of whom it is not entirely clear was aware that PR is a USA Commonwealth when Hurricane Maria hit, Not sure if he is now) have the audacity to call US not American?
Go learn something and fix you own ignorance before criticizing someone else referring to their roots.