I was playing an AUS game, and the foreign policy could use some work. I got no events to help Germany (though they were doing well, so maybe that's it) and I got an event which allowed me to declare war on Mexico, but there's no follow-up. I was hoping I would be guided into a grand liberation of South America and perhaps integration of Mexico or something, kind of like the CSA's events for Canada, but nothing of the sort happens.
Also, if the PSA annexes Hawaii, it's kind of impossible to annex them, or at least it was for me, as my ships couldn't go far enough to land troops in Hawaii. The AUS as a whole really could use more work!
Only solution I can think of for the second one would be an event triggering the surrender of the PSA if all their mainland territories are capped