Celestia didn't do promises. In fact, she had made over ten thousand false claims over her current ruling of Equestria, but luckily, her brain-dead supporters were too poorly educated to realize they were being duped. However, there was one thing everypony in Equestria could agree on: nopony wanted a harder life than they already had.

None of Equestria had wanted a trade war with the yaks, but Celestia reassured them all with absolute certainty that "trade wars are good and easy to win", restoring the faith that everypony had in her before...

... which was absolutely none.