Good question Jgoin and here's your answer - or part there of, anyway;

Because of the huge number of financial, trade and military affiliations the US has with other countries around the world,
politically, the US has a HUGE impact on it's partners / allies regarding the way the "Land of the Free" is governed.
Plus it's ever so important to these affiliated countries to help make sure that the US doesn't fuck up any more than it already has.

It's the ripple effect Jgoin.........

Nearly every country in the world was effected in some shape or form, financially or security wise when: (in more recent times after WW2)
- The Cold War started (including Bay of Pigs)
- Assassination of JFK
- Vietnam war (MASSIVE IMPACT) and HUGE fuck up by the US
- Reagan / Gorbachev knocking down the Berlin wall
- Iraq war #1
- 9/11 twin towers
- Iraq war #2
- Ongoing troubles in the middle east over US support for Israel
and so on and so on............

All these have impacted other countries around the world, based upon US presidential decisions.

I really do see your point about changing from the status quo and I somewhat hope it does happen some day
but even from abroad, the risk is simply far too great for everyone else around the globe
to let a person like trump have access to the codes to activate nuclear weapons and such other destructive military powers
because he has already demonstrated personal instability and unnecessary aggression towards other countries and he's not even in power!

So to summarize, Clinton is far from perfect but she knows how to do the job without putting the US and it's fragile economy
at further risk and you might actually be surprised just how well she goes, but as it's been stated many times here on P613;
for a government to govern, it's needs the backing of congress and this why Obama was not able to do things you think he shoulda been doing.

Nuff said.